T cells bearing the CD44hi "memory" phenotype display characteristics of activated cells in G1 stage of cell cycle.

Abstract excerpt

T cells capable of anamnestic proliferative responses to antigen in vitro (i.e., "memory" cells) have been shown to display the CD44hi CD45RBlo surface phenotype. To assess the state of activation of these T cells, CD4+ T cells expressing the CD44hi or CD45RBlo phenotype were compared to CD4+ T cells expressing the CD44lo or CD45RBhi phenotype in the context of expression of the "activated" (asialo-GM1hi) vs...

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