cytotoxic Tcells (CD8-positive) subset, similar populations appear to exist for both the helper Tcells (CD4-positive) and the cytotoxic Tcells. Primary
biomarkers CD4, FOXP3, and CD25 and are thought to be derived from the same lineage as naïve CD4+ cells. Because effector Tcells also express CD4 and CD25
molecular biology, CD4 (cluster of differentiation 4) is a glycoprotein that serves as a co-receptor for the T-cell receptor (TCR). CD4 is found on the surface