The function of Ensembl gene identifier ENSG00000165661 (QSOX2, quiescin sulfhydryl oxidase 2) is as follows. Sulfhydryl oxidase that catalyzes the oxidation of protein thiol groups to form disulfide bonds, with the reduction of oxygen to hydrogen peroxide (By similarity). May contribute to disulfide bond formation in secreted proteins (By similarity). May play a role in regulating the sensitization of neuroblastoma cells for interferon- gamma-induced apoptosis (PubMed:14633699). Required for normal ovarian function (By similarity). {ECO:0000250|UniProtKB:O00391, ECO:0000250|UniProtKB:Q3TMX7, ECO:0000269|PubMed:14633699}.