The function of Ensembl gene identifier ENSG00000142748 (FCN3, ficolin 3) is as follows. Calcium-dependent lectin, which acts as a pattern recognition receptor that initiates the lectin pathway of the complement system, a cascade of proteins that leads to phagocytosis and breakdown of pathogens and signaling that strengthens the adaptive immune system (PubMed:11907111, PubMed:15804047, PubMed:17215869, PubMed:26133042). Specifically recognizes and binds carbohydrates on the pathogen surface, activating the MASP1 serine protease and initiating the proteolytic cascade of the lectin complement pathway (PubMed:15804047, PubMed:17215869, PubMed:26133042). Specifically binds N- Acetylglucosamine (GlcNAc,) GalNAc (N-acetylgalactosamine) and D-fucose on the surface of pathogens, as well as mono/oligosaccharide and lipopolysaccharides from S.typhimurium and S.minnesota (PubMed:17215869). {ECO:0000269|PubMed:11907111, ECO:0000269|PubMed:15804047, ECO:0000269|PubMed:17215869, ECO:0000269|PubMed:26133042}.