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The 80-amino acid helical component of each triple peptide contain many Gly-X-Y sequences, where X and Y are [[proline]], [[isoleucine]], or [[hydroxylysine]]; they, therefore, strongly resemble [[collagen]] [[fibrils]].
===C1QA, C1QB, C1QC===
C1q is composed of 18 polypeptide chains: six A-chains, six B-chains, and six C-chains. Each chain contains a collagen-like region located near the N terminus and a C-terminal globular region. The A-, B-, and C-chains are arranged in the order A-C-B on chromosome 1. This gene encodes the A-chain polypeptide of human complement subcomponent C1q.<ref name="entrez ciqa">{{cite web | title = Entrez Gene: C1QA complement component 1, q subcomponent, A chain| url = http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=712| accessdate = }}</ref>
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