Immunogen sequence: DSENDFGNYN CTAVNRIGQE SLEFILVQAD TPSSPSIDQV EPYSSTAQVQ FDEPEATGGV PILKYKAEWR AVGEEVWHSK WYDAK. CD56, also known as neural cell adhesion molecule (NCAM), is a highly glycosylated transmembrane glycoprotein of the immunoglobulin family.