Immunogen sequence: GFQPKVQSRL VGGSSICEGT VEVRQGAQWA ALCDSSSARS SLRWEEVCQE QQCGSVNSYR VLDAGDPTSR GLFCPHQKLS QCHELWERNS YCKKVFVT. CD5 is a 67 kDa human T-lymphocyte single-chain transmembrane glycoprotein. CD5 is present on all mature T-lymphocytes, on mo