The function of Ensembl gene identifier ENSG00000074181 (NOTCH3, notch receptor 3) is as follows. Functions as a receptor for membrane-bound ligands Jagged1, Jagged2 and Delta1 to regulate cell-fate determination (PubMed:15350543, PubMed:14714274). Upon ligand activation through the released notch intracellular domain (NICD), it forms a transcriptional activator complex with RBPJ/RBPSUH and activates genes of the enhancer of split locus. Affects the implementation of differentiation, proliferation and apoptotic programs (By similarity). {ECO:0000250|UniProtKB:Q9R172, ECO:0000269|PubMed:14714274, ECO:0000269|PubMed:15350543}.