Collagen alpha-1(III) chain is a precursor to collagen III, a protein that is found in extensible connective tissues such as skin, lung, and the vascular system, frequently in association with type I collagen. Although alternate transcripts have been detected for this gene, they are the result of mutations; these mutations alter splicing, often leading to the exclusion of multiple exons.
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^Mayne, Richard; Burgeson, Robert E. Structure and Function of Collagen Types. Academic Press, Inc. ISBN0-12-481280-5.