IL4 and infection: Given that the TCR sequencing data show that the most prominent IL-4+ clones in the lymph nodes are also often found in IL-4+ lung populations and given lymph nodes are highly enriched for Tfh2 cells, while the lung is almost exclusively made up of Th2 cells at this time during infection, it is likely that many Tfh2 and Th2 cells share clonality.