CD8A and neoplasm: Deletion of Id2 resulted in a marginally decreased frequency of tumor-infiltrating central memory cells (CD44+CD62L+) among adoptive CD45.2+ OT-I CD8+ T cells from Id2fl/flCd4-Cre+ OT-I mice compared to those from Id2fl/flCd4-Cre− OT-I mice (Fig. 5A).