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Collagen alpha-1(XXI) chain is a protein that in humans is encoded by the COL21A1gene. The protein is an extracellular matrix component of blood vessel walls, secreted by smooth-muscle cells. The protein may contribute to the extracellular matrix assembly of the vascular network during blood vessel formation.
Chou MY, Li HC (March 2002). "Genomic organization and characterization of the human type XXI collagen (COL21A1) gene". Genomics. 79 (3): 395–401. doi:10.1006/geno.2002.6712. PMID11863369.