part of collagen trimer collagenous component of basement membrane extracellular protein-containing complex collagen type XIX trimer https://github.com/geneontology/go-ontology/issues/29569 A collagen homotrimer made of three alpha1(XIX) collagen chains, each presenting interrupted triple helical collagen domains. Localizes to basement membrane ECMs, not known to associate with any fibrillar collagens that are predominantly found in the interstitial extracellular matrix. GO:1990318 2014-03-14T16:05:57Z bhm cellular_component The collagen XIX trimer is often classified as a FACIT collagen trimer (which stands for Fibril Associated Collagens with Interrupted Triple helices) because of the presence of interrupted triple helical collagen domains, similar to other FACIT members. However, evidence show that collagen XIX localizes to basement membrane ECMs, and none of the basement membrane collagens are fibrillar.