has plasma membrane part lacks_plasma_membrane_part CD4-positive, alpha-beta T cell A mature alpha-beta T cell that expresses an alpha-beta T cell receptor and the CD4 coreceptor. CD4-positive, alpha-beta T-cell CD4-positive, alpha-beta T lymphocyte CD4-positive, alpha-beta T-lymphocyte cell mature alpha-beta T cell CD4 molecule T cell receptor co-receptor CD8