BCL-2 expression in T cells exposed to chemotherapy. T cells from a normal donor either in bulk or sorted into subsets were exposed to chemotherapy and allowed to recover. Live cells were examined by intracellular flow cytometry for BCL-2 expression. Naive cells had higher baseline BCL-2 than memory cells, and memory T cells that survived cyclophosphamide had high BCL-2 levels compared with controls. *P < .01.