Collagen, type XXVIII, alpha 1 also known as COL28A1 is a protein that in humans is encoded by the COL28A1gene. This protein belongs to a class of collagens that contain von Willebrand factor type A domains. The protein is encoded by the COL28A1gene which contains 45 exons and is found of the p arm of chromosome 7.
^Veit G, Kobbe B, Keene DR, Paulsson M, Koch M, Wagener R (Feb 2006). "Collagen XXVIII, a novel von Willebrand factor A domain-containing protein with many imperfections in the collagenous domain". The Journal of Biological Chemistry. 281 (6): 3494–504. doi:10.1074/jbc.M509333200. PMID16330543.