This family consists of several repeated sequences of around 34 residues in length. This repeat is found in multiple copies in the Drosophila pericardin and other extracellular matrix proteins.

1: Pericardin, a Drosophila type IV collagen-like protein is involved in the morphogenesis and maintenance of the heart epithelium during dorsal ectoderm closure. Chartier A, Zaffran S, Astier M, Semeriva M, Gratecos D; Development 2002;129:3241-3253. PMID:12070098

2: Isolation and characterization of cDNA encoding a spicule matrix protein in Hemicentrotus pulcherrimus micromeres. Katoh-Fukui Y, Noce T, Ueda T, Fujiwara Y, Hashimoto N, Tanaka S, Higashinakagawa T; Int J Dev Biol 1992;36:353-361. PMID:1445780