Monooxygenase catalytic activity (PubMed:38442170). Involved in regulation of cytokinesis; promotes RHOA activity, probably acting locally at the midbody in late cytokinesis (PubMed:38442170). Monooxygenase activity is involved in stabilizing transient structures between daughter cells, termed intercellular bridges, before abscission (PubMed:38442170). Regulates differentiation and proliferation through the regulation of cell death (PubMed:11459809, PubMed:14570898). {ECO:0000269|PubMed:11459809, ECO:0000269|PubMed:14570898, ECO:0000269|PubMed:38442170}. This is the function of ENSG00000140961 (OSGIN1, oxidative stress induced growth inhibitor 1).