. "Catalysis of the reaction: (S)-2,3-epoxysqualene = lanosterol. This is a cyclization reaction that forms the sterol nucleus." . . "OSC" . "lanosterol synthase activity" . "(S)-2,3-epoxysqualene mutase (cyclizing, lanosterol-forming)" . "2,3-epoxysqualene lanosterol cyclase activity" . "2,3-epoxysqualene--lanosterol cyclase activity" . "2,3-epoxysqualene-lanosterol cyclase activity" . "2,3-oxidosqualene sterol cyclase activity" . "2,3-oxidosqualene-lanosterol cyclase activity" . "lanosterol 2,3-oxidosqualene cyclase activity" . "oxidosqualene--lanosterol cyclase activity" . "oxidosqualene-lanosterol cyclase activity" . "oxidosqualene:lanosterol cyclase activity" . "squalene 2,3-epoxide:lanosterol cyclase activity" . "squalene epoxidase-cyclase activity" . "squalene-2,3-oxide-lanosterol cyclase activity" . . .