Resumen de For T cells, the child is father of the man

Kristin A. Hogquist, Sara E. Hamilton

• When T cells respond to infectious agents, they differentiate into effector and memory cells. In this issue of Cell, Smith et al. use a genetic “time-stamping” method to show that the developmental time the T cell arises—near birth or as an adult—dictates what type of T effector or memory cell results.