The function of Ensembl gene identifier ENSG00000104549 (SQLE, squalene epoxidase) is as follows. Catalyzes the stereospecific oxidation of squalene to (S)-2,3-epoxysqualene, and is considered to be a rate-limiting enzyme in steroid biosynthesis. {ECO:0000269|PubMed:10666321, ECO:0000269|PubMed:30626872}.