Research output per year
Research output per year
- 1 - 50 out of 212 results
Search results
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2025
The maternal-fetal interface at single-cell resolution: uncovering the cellular anatomy of the placenta and decidua
Levenson, D., Romero, R., Miller, D., Galaz, J., Garcia-Flores, V., Neshek, B., Pique-Regi, R. & Gomez-Lopez, N., Apr 2025, In: American journal of obstetrics and gynecology. 232, 4, p. S55-S79Research output: Contribution to journal › Review article › peer-review
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The single-cell immune profile throughout gestation and its potential value for identifying women at risk for spontaneous preterm birth
Feyaerts, D., Diop, M., Galaz, J., Einhaus, J. F., Arck, P. C., Diemert, A., Winn, V. D., Parast, M., Gyamfi-Bannerman, C., Prins, J. R., Gomez-Lopez, N. & Stelzer, I. A., Mar 2025, In: European Journal of Obstetrics and Gynecology and Reproductive Biology: X. 25, 100371.Research output: Contribution to journal › Review article › peer-review
Open Access -
2024
A mitochondrial regulator protein, MNRR1, is elevated in the maternal blood of women with preeclampsia
Suksai, M., Romero, R., Bosco, M., Gotsch, F., Jung, E., Chaemsaithong, P., Tarca, A. L., Gudicha, D. W., Gomez-Lopez, N., Arenas-Hernandez, M., Meyyazhagan, A., Grossman, L. I., Aras, S. & Chaiworapongsa, T., 2024, In: Journal of Maternal-Fetal and Neonatal Medicine. 37, 1, 2297158.Research output: Contribution to journal › Article › peer-review
Open Access -
Clinical chorioamnionitis at term: definition, pathogenesis, microbiology, diagnosis, and treatment
Jung, E., Romero, R., Suksai, M., Gotsch, F., Chaemsaithong, P., Erez, O., Conde-Agudelo, A., Gomez-Lopez, N., Berry, S. M., Meyyazhagan, A. & Yoon, B. H., Mar 2024, In: American journal of obstetrics and gynecology. 230, 3, p. S807-S840Research output: Contribution to journal › Review article › peer-review
35 Scopus citations -
Deciphering maternal-fetal cross-talk in the human placenta during parturition using single-cell RNA sequencing
Garcia-Flores, V., Romero, R., Tarca, A. L., Peyvandipour, A., Xu, Y., Galaz, J., Miller, D., Chaiworapongsa, T., Chaemsaithong, P., Berry, S. M., Awonuga, A. O., Bryant, D. R., Pique-Regi, R. & Gomez-Lopez, N., 2024, In: Science translational medicine. 16, 729, 8335.Research output: Contribution to journal › Article › peer-review
25 Scopus citations -
Dissociation of Placental Tissues for Single-Cell Techniques
Garcia-Flores, V., Miller, D., Galaz, J. & Gomez-Lopez, N., 2024, Methods in Molecular Biology. Humana Press Inc., p. 143-154 12 p. (Methods in Molecular Biology; vol. 2781).Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review
1 Scopus citations -
Homeostatic Macrophages Prevent Preterm Birth and Improve Neonatal Outcomes by Mitigating In Utero Sterile Inflammation in Mice
Garcia-Flores, V., Liu, Z., Romero, R., Pique-Regi, R., Xu, Y., Miller, D., Levenson, D., Galaz, J., Winters, A. D., Farias-Jofre, M., Panzer, J. J., Theis, K. R. & Gomez-Lopez, N., Dec 2024, In: Journal of Immunology. 213, 11, p. 1620-1634 15 p.Research output: Contribution to journal › Article › peer-review
Open Access1 Scopus citations -
Immunophenotyping of Leukocytes in Amniotic Fluid
Xu, Y., Miller, D., Galaz, J. & Gomez-Lopez, N., 2024, Methods in Molecular Biology. Humana Press Inc., p. 155-162 8 p. (Methods in Molecular Biology; vol. 2781).Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review
1 Scopus citations -
Predicting Spontaneous Preterm Birth Using the Immunome
Feyaerts, D., Marić, I., Arck, P. C., Prins, J. R., Gomez-Lopez, N., Gaudillière, B. & Stelzer, I. A., Jun 2024, In: Clinics in Perinatology. 51, 2, p. 441-459 19 p.Research output: Contribution to journal › Review article › peer-review
2 Scopus citations -
Proteomic Profiles of Maternal Plasma Extracellular Vesicles for Prediction of Preeclampsia
Than, N. G., Romero, R., Fitzgerald, W., Gudicha, D. W., Gomez-Lopez, N., Posta, M., Zhou, F., Bhatti, G., Meyyazhagan, A., Awonuga, A. O., Chaiworapongsa, T., Matthies, D., Bryant, D. R., Erez, O., Margolis, L. & Tarca, A. L., Oct 1 2024, In: American journal of reproductive immunology (New York, N.Y. : 1989). 92, 4, p. e13928Research output: Contribution to journal › Article › peer-review
3 Scopus citations -
2023
A key role for NLRP3 signaling in preterm labor and birth driven by the alarmin S100B
Galaz, J., Motomura, K., Romero, R., Liu, Z., Garcia-Flores, V., Tao, L., Xu, Y., Done, B., Arenas-Hernandez, M., Kanninen, T., Farias-Jofre, M., Miller, D., Tarca, A. L. & Gomez-Lopez, N., Sep 2023, In: Translational Research. 259, p. 46-61 16 p.Research output: Contribution to journal › Article › peer-review
11 Scopus citations -
A single-cell atlas of murine reproductive tissues during preterm labor
Garcia-Flores, V., Romero, R., Peyvandipour, A., Galaz, J., Pusod, E., Panaitescu, B., Miller, D., Xu, Y., Tao, L., Liu, Z., Tarca, A. L., Pique-Regi, R. & Gomez-Lopez, N., Jan 31 2023, In: Cell Reports. 42, 1, 111846.Research output: Contribution to journal › Article › peer-review
Open Access21 Scopus citations -
Blockade of IL-6R prevents preterm birth and adverse neonatal outcomes
Farias-Jofre, M., Romero, R., Galaz, J., Xu, Y., Miller, D., Garcia-Flores, V., Arenas-Hernandez, M., Winters, A. D., Berkowitz, B. A., Podolsky, R. H., Shen, Y., Kanninen, T., Panaitescu, B., Glazier, C. R., Pique-Regi, R., Theis, K. R. & Gomez-Lopez, N., Dec 2023, In: EBioMedicine. 98, 104865.Research output: Contribution to journal › Article › peer-review
Open Access9 Scopus citations -
Blockade of IL-6R prevents preterm birth and adverse neonatal outcomes
Farias-Jofre, M., Romero, R., Galaz, J., Xu, Y., Miller, D., Garcia-Flores, V., Arenas-Hernandez, M., Winters, A. D., Berkowitz, B. A., Podolsky, R. H., Shen, Y., Kanninen, T., Panaitescu, B., Glazier, C. R., Pique-Regi, R., Theis, K. R. & Gomez-Lopez, N., Dec 2023, In: EBioMedicine. 98, 104865.Research output: Contribution to journal › Article › peer-review
Open Access -
Clinical chorioamnionitis at term is characterized by changes in the plasma concentration of CHCHD2/MNRR1, a mitochondrial protein
Bosco, M., Romero, R., Gallo, D. M., Suksai, M., Gotsch, F., Jung, E., Chaemsaithong, P., Tarca, A. L., Gomez-Lopez, N., Arenas-Hernandez, M., Meyyazhagan, A., Al Qasem, M., Franchi, M. P., Grossman, L. I., Aras, S. & Chaiworapongsa, T., 2023, In: Journal of Maternal-Fetal and Neonatal Medicine. 36, 2, 2222333.Research output: Contribution to journal › Article › peer-review
Open Access1 Scopus citations -
Differential immunophenotype of circulating monocytes from pregnant women in response to viral ligands
Farias-Jofre, M., Romero, R., Xu, Y., Levenson, D., Tao, L., Kanninen, T., Galaz, J., Arenas-Hernandez, M., Liu, Z., Miller, D., Bhatti, G., Seyerle, M., Tarca, A. L. & Gomez-Lopez, N., Dec 2023, In: BMC Pregnancy and Childbirth. 23, 1, 323.Research output: Contribution to journal › Article › peer-review
Open Access3 Scopus citations -
Evidence for the participation of CHCHD2/MNRR1, a mitochondrial protein, in spontaneous labor at term and in preterm labor with intra-amniotic infection
Bosco, M., Romero, R., Gallo, D. M., Suksai, M., Gotsch, F., Jung, E., Chaemsaithong, P., Tarca, A. L., Gomez-Lopez, N., Arenas-Hernandez, M., Meyyazhagan, A., Al Qasem, M., Franchi, M. P., Grossman, L. I., Aras, S. & Chaiworapongsa, T., 2023, In: Journal of Maternal-Fetal and Neonatal Medicine. 36, 1, 2183088.Research output: Contribution to journal › Article › peer-review
Open Access1 Scopus citations -
Further Evidence that an Episode of Premature Labor Is a Pathologic State: Involvement of the Insulin-Like Growth Factor System
Prasad, P., Romero, R., Chaiworapongsa, T., Gomez-Lopez, N., Lo, A., Galaz, J., Taran, A. B., Jung, E., Gotsch, F., Than, N. G. & Tarca, A. L., Oct 1 2023, In: Fetal Diagnosis and Therapy. 50, 4, p. 236-247 12 p.Research output: Contribution to journal › Article › peer-review
1 Scopus citations -
Host-microbiome interactions in distinct subsets of preterm labor and birth
Galaz, J., Romero, R., Greenberg, J. M., Theis, K. R., Arenas-Hernandez, M., Xu, Y., Farias-Jofre, M., Miller, D., Kanninen, T., Garcia-Flores, V. & Gomez-Lopez, N., Dec 15 2023, In: iScience. 26, 12, 108341.Research output: Contribution to journal › Article › peer-review
Open Access6 Scopus citations -
Immune-featured decidual stromal cells: pregnancy's multitasking superstars
Gomez-Lopez, N., Nov 2023, In: Trends in Immunology. 44, 11, p. 862-864 3 p.Research output: Contribution to journal › Short survey › peer-review
1 Scopus citations -
Immunosequencing and Profiling of T Cells at the Maternal-Fetal Interface of Women with Preterm Labor and Chronic Chorioamnionitis
Miller, D., Romero, R., Myers, L., Xu, Y., Arenas-Hernandez, M., Galaz, J., Soto, C., Done, B., Quiroz, A., Awonuga, A. O., Bryant, D. R., Tarca, A. L. & Gomez-Lopez, N., Oct 1 2023, In: Journal of Immunology. 211, 7, p. 1082-1098 17 p.Research output: Contribution to journal › Article › peer-review
4 Scopus citations -
Is there a placental microbiota? A critical review and re-analysis of published placental microbiota datasets
Panzer, J. J., Romero, R., Greenberg, J. M., Winters, A. D., Galaz, J., Gomez-Lopez, N. & Theis, K. R., Dec 2023, In: BMC Microbiology. 23, 1, 76.Research output: Contribution to journal › Article › peer-review
Open Access30 Scopus citations -
Maternal plasma cytokines and the subsequent risk of uterine atony and postpartum hemorrhage
Gallo, D. M., Romero, R., Bosco, M., Chaiworapongsa, T., Gomez-Lopez, N., Arenas-Hernandez, M., Jung, E., Suksai, M., Gotsch, F., Erez, O. & Tarca, A. L., Feb 1 2023, In: Journal of Perinatal Medicine. 51, 2, p. 219-232 14 p.Research output: Contribution to journal › Article › peer-review
10 Scopus citations -
Microbiome preterm birth DREAM challenge: Crowdsourcing machine learning approaches to advance preterm birth research
The Preterm Birth DREAM Community, 2023, (Accepted/In press) In: Cell Reports Medicine. 5, 1, 101350.Research output: Contribution to journal › Article › peer-review
Open Access14 Scopus citations -
One-third of patients with eclampsia at term do not have an abnormal angiogenic profile
Chaiworapongsa, T., Romero, R., Gotsch, F., Gomez-Lopez, N., Suksai, M., Gallo, D. M., Jung, E., Levenson, D. & Tarca, A. L., Jun 1 2023, In: Journal of Perinatal Medicine. 51, 5, p. 652-663 12 p.Research output: Contribution to journal › Article › peer-review
Open Access2 Scopus citations -
Preeclampsia at term: evidence of disease heterogeneity based on the profile of circulating cytokines and angiogenic factors
Chaiworapongsa, T., Romero, R., Gomez-Lopez, N., Suksai, M., Gallo, D. M., Jung, E., Berry, S. M., Awonuga, A., Tarca, A. L. & Bryant, D. R., 2023, (Accepted/In press) In: American journal of obstetrics and gynecology. 230, 4, p. 450.e1-450.e18Research output: Contribution to journal › Article › peer-review
4 Scopus citations -
Pregnancy-specific responses to COVID-19 revealed by high-throughput proteomics of human plasma
Gomez-Lopez, N., Romero, R., Escobar, M. F., Carvajal, J. A., Echavarria, M. P., Albornoz, L. L., Nasner, D., Miller, D., Gallo, D. M., Galaz, J., Arenas-Hernandez, M., Bhatti, G., Done, B., Zambrano, M. A., Ramos, I., Fernandez, P. A., Posada, L., Chaiworapongsa, T., Jung, E. & Garcia-Flores, V. & 5 others, , Dec 2023, In: Communications Medicine. 3, 1, 48.Research output: Contribution to journal › Article › peer-review
Open Access9 Scopus citations -
Preparation of single-cell suspensions from the human placenta
Garcia-Flores, V., Xu, Y., Pusod, E., Romero, R., Pique-Regi, R. & Gomez-Lopez, N., Mar 2023, In: Nature Protocols. 18, 3, p. 732-754 23 p.Research output: Contribution to journal › Article › peer-review
Open Access14 Scopus citations -
Proteomic profile of extracellular vesicles in maternal plasma of women with fetal death
Gallo, D. M., Fitzgerald, W., Romero, R., Gomez-Lopez, N., Gudicha, D. W., Than, N. G., Bosco, M., Chaiworapongsa, T., Jung, E., Meyyazhagan, A., Suksai, M., Gotsch, F., Erez, O., Tarca, A. L. & Margolis, L., 2023, In: Journal of Maternal-Fetal and Neonatal Medicine. 36, 1, 2177529.Research output: Contribution to journal › Article › peer-review
Open Access6 Scopus citations -
The amniotic fluid proteome changes with term labor and informs biomarker discovery in maternal plasma
Bhatti, G., Romero, R., Gomez-Lopez, N., Chaiworapongsa, T., Than, N. G., Theis, K. R., Galaz, J., Gotsch, F., Pique-Regi, R., Berry, S. M., Kavdia, M. & Tarca, A. L., Dec 2023, In: Scientific reports. 13, 1, 3136.Research output: Contribution to journal › Article › peer-review
Open Access6 Scopus citations -
The effects of progesterone on immune cellular function at the maternal-fetal interface and in maternal circulation
Motomura, K., Miller, D., Galaz, J., Liu, T. N., Romero, R. & Gomez-Lopez, N., May 2023, In: Journal of Steroid Biochemistry and Molecular Biology. 229, 106254.Research output: Contribution to journal › Article › peer-review
29 Scopus citations -
The MNRR1 activator nitazoxanide abrogates lipopolysaccharide-induced preterm birth in mice
Purandare, N., Gomez-Lopez, N., Arenas-Hernandez, M., Galaz, J., Romero, R., Xi, Y., Fribley, A. M., Grossman, L. I. & Aras, S., Sep 7 2023, In: Placenta. 140, p. 66-71 6 p.Research output: Contribution to journal › Article › peer-review
2 Scopus citations -
The vaginal microbiota of pregnant women varies with gestational age, maternal age, and parity
Romero, R., Theis, K. R., Gomez-Lopez, N., Winters, A. D., Panzer, J. J., Lin, H., Galaz, J., Greenberg, J. M., Shaffer, Z., Kracht, D. J., Chaiworapongsa, T., Jung, E., Gotsch, F., Ravel, J., Peddada, S. D. & Tarca, A. L., Aug 2023, In: Microbiology spectrum. 11, 4Research output: Contribution to journal › Article › peer-review
Open Access18 Scopus citations -
Thymic stromal lymphopoietin participates in the host response to intra-amniotic inflammation leading to preterm labor and birth
Kanninen, T., Tao, L., Romero, R., Xu, Y., Arenas-Hernandez, M., Galaz, J., Liu, Z., Miller, D., Levenson, D., Greenberg, J. M., Panzer, J., Padron, J., Theis, K. R. & Gomez-Lopez, N., Sep 2023, In: Human Immunology. 84, 9, p. 450-463 14 p.Research output: Contribution to journal › Article › peer-review
2 Scopus citations -
2022
A longitudinal study of cervical tissue composition changes during normal pregnancy in mice using spectroscopic photoacoustic
Yan, Y., Galaz, J., Basij, M., Yellon, S., Gomez-Lopez, N. & Mehrmohammadi, M., 2022, Biomedical Spectroscopy, Microscopy, and Imaging II. Popp, J. & Gergely, C. (eds.). SPIE, 121440G. (Proceedings of SPIE - The International Society for Optical Engineering; vol. 12144).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review
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A single-cell atlas of the myometrium in human parturition
Pique-Regi, R., Romero, R., Garcia-Flores, V., Peyvandipour, A., Tarca, A. L., Pusod, E., Galaz, J., Miller, D., Bhatti, G., Para, R., Kanninen, T., Hadaya, O., Paredes, C., Motomura, K., Johnson, J. R., Jung, E., Hsu, C. D., Berry, S. M. & Gomez-Lopez, N., Mar 8 2022, In: JCI Insight. 7, 5, e153921.Research output: Contribution to journal › Article › peer-review
Open Access45 Scopus citations -
Cellular immune responses in the pathophysiology of preeclampsia
Miller, D., Motomura, K., Galaz, J., Gershater, M., Lee, E. D., Romero, R. & Gomez-Lopez, N., Jan 2022, In: Journal of Leukocyte Biology. 111, 1, p. 237-260 24 p.Research output: Contribution to journal › Article › peer-review
72 Scopus citations -
Cervical insufficiency, amniotic fluid sludge, intra-amniotic infection, and maternal bacteremia: the need for a point-of-care test to assess inflammation and bacteria in amniotic fluid
Jung, E. J., Romero, R., Gomez-Lopez, N., Paredes, C., Diaz-Primera, R., Hernandez-Andrade, E., Hsu, C. D. & Yeo, L., 2022, In: Journal of Maternal-Fetal and Neonatal Medicine. 35, 24, p. 4775-4781 7 p.Research output: Contribution to journal › Article › peer-review
5 Scopus citations -
Clarithromycin prevents preterm birth and neonatal mortality by dampening alarmin-induced maternal–fetal inflammation in mice
Galaz, J., Romero, R., Arenas-Hernandez, M., Farias-Jofre, M., Motomura, K., Liu, Z., Kawahara, N., Demery-Poulos, C., Liu, T. N., Padron, J., Panaitescu, B. & Gomez-Lopez, N., Dec 2022, In: BMC Pregnancy and Childbirth. 22, 1, 503.Research output: Contribution to journal › Article › peer-review
Open Access10 Scopus citations -
Defining a role for Interferon Epsilon in normal and complicated pregnancies
Miller, D., Romero, R., Kacerovsky, M., Musilova, I., Galaz, J., Garcia-Flores, V., Xu, Y., Pusod, E., Demery-Poulos, C., Gutierrez-Contreras, P., Liu, T. N., Jung, E., Theis, K. R., Coleman, L. A. & Gomez-Lopez, N., Jul 2022, In: Heliyon. 8, 7, e09952.Research output: Contribution to journal › Article › peer-review
Open Access2 Scopus citations -
Distinct Cellular Immune Responses to SARS-CoV-2 in Pregnant Women
Gomez-Lopez, N., Romero, R., Tao, L., Gershater, M., Leng, Y., Zou, C., Farias-Jofre, M., Galaz, J., Miller, D., Tarca, A. L., Arenas-Hernandez, M., Bhatti, G., Garcia-Flores, V., Liu, Z., Para, R., Kanninen, T., Hadaya, O., Paredes, C. & Xu, Y., Apr 15 2022, In: Journal of Immunology. 208, 8, p. 1857-1872 16 p.Research output: Contribution to journal › Article › peer-review
Open Access17 Scopus citations -
Does the Amniotic Fluid of Mice Contain a Viable Microbiota?
Winters, A. D., Romero, R., Greenberg, J. M., Galaz, J., Shaffer, Z. D., Garcia-Flores, V., Kracht, D. J., Gomez-Lopez, N. & Theis, K. R., Feb 28 2022, In: Frontiers in immunology. 13, 820366.Research output: Contribution to journal › Article › peer-review
Open Access15 Scopus citations -
Fetal and maternal NLRP3 signaling is required for preterm labor and birth
Motomura, K., Romero, R., Galaz, J., Tao, L., Garcia-Flores, V., Xu, Y., Done, B., Arenas-Hernandez, M., Miller, D., Gutierrez-Contreras, P., Farias-Jofre, M., Aras, S., Grossman, L. I., Tarca, A. L. & Gomez-Lopez, N., Aug 22 2022, In: JCI Insight. 7, 16, e158238.Research output: Contribution to journal › Article › peer-review
Open Access24 Scopus citations -
Human Plasma Proteome during Normal Pregnancy
Tarca, A. L., Romero, R., Bhatti, G., Gotsch, F., Done, B., Gudicha, D. W., Gallo, D. M., Jung, E., Pique-Regi, R., Berry, S. M., Chaiworapongsa, T. & Gomez-Lopez, N., Nov 4 2022, In: Journal of Proteome Research. 21, 11, p. 2687-2702 16 p.Research output: Contribution to journal › Article › peer-review
10 Scopus citations -
IL-22 Plays a Dual Role in the Amniotic Cavity: Tissue Injury and Host Defense against Microbes in Preterm Labor
Gershater, M., Romero, R., Arenas-Hernandez, M., Galaz, J., Motomura, K., Tao, L., Xu, Y., Miller, D., Pique-Regi, R., Martinez, G., Liu, Y., Jung, E., Para, R. & Gomez-Lopez, N., Apr 1 2022, In: Journal of Immunology. 208, 7, p. 1595-1615 21 p.Research output: Contribution to journal › Article › peer-review
Open Access10 Scopus citations -
Lipopolysaccharide induces placental mitochondrial dysfunction in murine and human systems by reducing MNRR1 levels via a TLR4-independent pathway
Purandare, N., Kunji, Y., Xi, Y., Romero, R., Gomez-Lopez, N., Fribley, A., Grossman, L. I. & Aras, S., Nov 18 2022, In: iScience. 25, 11, 105342.Research output: Contribution to journal › Article › peer-review
Open Access6 Scopus citations -
Maternal circulating concentrations of soluble Fas and Elabela in early- and late-onset preeclampsia
Para, R., Romero, R., Gomez-Lopez, N., Tarca, A. L., Panaitescu, B., Done, B., Hsu, R., Pacora, P. & Hsu, C. D., 2022, In: Journal of Maternal-Fetal and Neonatal Medicine. 35, 2, p. 316-329 14 p.Research output: Contribution to journal › Article › peer-review
11 Scopus citations -
Maternal-fetal immune responses in pregnant women infected with SARS-CoV-2
Garcia-Flores, V., Romero, R., Xu, Y., Theis, K. R., Arenas-Hernandez, M., Miller, D., Peyvandipour, A., Bhatti, G., Galaz, J., Gershater, M., Levenson, D., Pusod, E., Tao, L., Kracht, D., Florova, V., Leng, Y., Motomura, K., Para, R., Faucett, M. & Hsu, C. D. & 4 others, , Dec 2022, In: Nature communications. 13, 1, 320.Research output: Contribution to journal › Article › peer-review
Open Access149 Scopus citations -
Maternal-Fetal Immunology
Gomez-Lopez, N., Oct 15 2022, In: Journal of Immunology. 209, 8, p. 1417-1418 2 p.Research output: Contribution to journal › Editorial
1 Scopus citations -
Microbiota of the Pregnant Mouse: Characterization of the Bacterial Communities in the Oral Cavity, Lung, Intestine, and Vagina through Culture and DNA Sequencing
Greenberg, J. M., Romero, R., Winters, A. D., Galaz, J., Garcia-Flores, V., Arenas-Hernandez, M., Panzer, J., Shaffer, Z., Kracht, D. J., Gomez-Lopez, N. & Theis, K. R., Aug 2022, In: Microbiology spectrum. 10, 4Research output: Contribution to journal › Article › peer-review
Open Access9 Scopus citations