There was an error in the loading control for Fig. 2C. Some of the samples used in Fig. 2B were run on a separate gel in parallel and probed for COX-2, shown in Fig. 2C. The ERK loading control immunoblot from Fig. 2B was reused, but since the samples were run in a different order in the COX-2 immunoblot, the corresponding ERK lanes were out of order. Additionally, an intervening lane (the 1 μM A4-NP lane from Fig. 2B) was spliced out and was not indicated. This error has now been corrected and does not affect the results or conclusions of this work. (Figur presented).