From the article The Collagen Family by Ricard-Blum (http://cshperspectives.cshlp.org/content/early/2010/12/13/cshperspect.a004978.full.pdf)
A novel epidermal collagen has been called collagen XXIX, but the COL29A1 gene was shown to be identical to the COL6A5 gene, and the a1(XXIX) chain corresponds to the a5(VI) chain
So is there a collagen type 29 or not?
I've also seen websites selling antibodies for it. (http://www.cloud-clone.com/items/D125.html)
Collagen Type XXIX belongs to the class of collagens containing von Willebrand factor (VWF) type A (vWA) domains. These collagens form filaments with globular domains containing vWA motifs, which are involved in protein-ligand interactions for the organization of tissue architecture and cell adhesion , OL29A contains 6 N-terminal and 3 C-terminal vWA domains flanking a short collagen triple helix, and an 18-amino acid secretion signal. Northern blot analysis detected a 9.6-kb transcript in human skin. RT-PCR analysis detected highest expression in skin, followed by lung, small intestine, colon, and testis.
References
Variants in a novel epidermal collagen gene (COL29A1) are associated with atopic dermatitis."PLoS Biol. 5:1952-1961(2007)
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