CD4-positive, alpha-beta T cell effector T cell effector CD4-positive, alpha-beta T cell A CD4-positive, alpha-beta T cell with the phenotype CCR7-negative, CD45RA-positive. This cell type is compatible with the HIPC Lyoplate markers for 'effector CD4+ T cell'. The functional characteristics of this cell type currently undefined in CL, which affects its proper placement within the hierarchy. cell effector CD4+ T cell effector CD4-positive, alpha-beta T lymphocyte effector CD4-positive, alpha-beta T-cell effector CD4-positive, alpha-beta T-lymphocyte