T helper cellThe T helper cells (Th cells ), also known as CD4 + cells or CD4 -positive cells , are a type of T cell that play an important role in the adaptive immune
T celland CD4 + "helper" T cells . (These are named for the presence of the cell surface proteins CD8 or CD4 .) CD8+ T cells , also known as "killer T cells ", are
Cytotoxic T cellexpress both the CD4 and CD8 co-receptors and are therefore termed "double-positive" (DP) T cells (CD4 +CD8+). The double-positive T cells are exposed to
Memory T cell cytotoxic T cells (CD8-positive) subset, similar populations appear to exist for both the helper T cells (CD4 -positive) and the cytotoxic T cells . Primary
Regulatory T cell that express CD4 , CD25, and FOXP3 (CD4 +CD25+ regulatory T cells ). These Treg cells are different from helper T cells . Another regulatory T cell subset is