FCRL5 and infection: Surprisingly, we observed that after resolution of infection (155-170dpi), MSP121-specific B cells expressing different combinations of CD80 and CD273 (CD80+CD273+, CD80-CD273+ or CD80+CD273-) all expressed very high levels of FCRL5, in contrast to CD80-CD273- MSP121-specific B cells that express no memory markers at this stage (Figure 6A).