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Paine-Saunders S, Viviano BL, Saunders S (Aug 1999). "GPC6, a novel member of the glypican gene family, encodes a product structurally related to GPC4 and is colocalized with GPC5 on human chromosome 13". Genomics. 57 (3): 455–8. doi:10.1006/geno.1999.5793. PMID10329016.