PTPRC and infection: Despite variable numbers of YFP+ B cells observed with the different viruses, there was little differences noted in the total number of germinal center (GC) B cells (CD3−CD4−CD8−/B220+, GL7+CD95+) and plasma cells (CD3−CD4−CD8−/B220l°CD138hi) upon infection via either IN or IP route (Figures 5C–5F).