An extracellular matrix structural constituent. Acts upstream of or within several processes, including circulatory system development; collagen fibril organization; and tendon development. Located in basement membrane. Part of collagen trimer. Is expressed in several structures, including embryo mesenchyme; extraembryonic component; genitourinary system; heart; and skeleton. Used to study Ehlers-Danlos syndrome classic type 1. Human ortholog(s) of this gene implicated in Ehlers-Danlos syndrome and Ehlers-Danlos syndrome classic type 1. Orthologous to human COL5A1 (collagen type V alpha 1 chain). [provided by Alliance of Genome Resources, Apr 2022]