The function of COL13A1 (collagen type XIII alpha 1 chain, ENSG00000197467) is as follows. Involved in cell-matrix and cell-cell adhesion interactions that are required for normal development. May participate in the linkage between muscle fiber and basement membrane. May play a role in endochondral ossification of bone and branching morphogenesis of lung. Binds heparin. At neuromuscular junctions, may play a role in acetylcholine receptor clustering (PubMed:26626625). {ECO:0000250|UniProtKB:Q9R1N9, ECO:0000269|PubMed:10865988, ECO:0000269|PubMed:11956183, ECO:0000269|PubMed:26626625}.