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In immunology, the CD57 antigen (CD stands for cluster of differentiation) is a protein which is also called HNK1 (human natural killer-1) or LEU7. It is a neuronally expressed adhesion molecule with a carbohydrate epitope that contains a sulfoglucuronyl residue.[1]


  1. [1] Mitsumoto Y, Oka S, Sakuma H, Inazawa J, Kawasaki T. "Cloning and chromosomal mapping of human glucuronyltransferase involved in biosynthesis of the HNK-1 carbohydrate epitope." Genomics. 2000 Apr 15;65(2):166-73. PMID: 10783264