Ralph M. Steinman's work on dendritic cells began in 1973 when he described and named the cells. Reminiscent of the late Justice Ginsburg's perspective that enduring change happens not suddenly but one step at a time, the paper (1973. J. Exp. Med. https://doi.org/10.1084/jem.137.5.1142) was notably the first step in many steps of important work that revealed the nature of dendritic cells.