Class II-independent generation of CD4 memory T cells from effectors.

The factors required for the generation of memory CD4 T cells remain unclear, and whether there is a continuing requirement for antigen stimulation is critical to design of vaccine strategies. CD4 effectors generated in vitro from naïve CD4 T cells of mice efficiently gave rise to small resting memory cells after transfer to class II-deficient hosts, indicating no requirement for further antigen or class II recognition.