cycloartenol synthase; 2,3-epoxysqualene cycloartenol-cyclase; squalene-2,3-epoxide-cycloartenol cyclase; 2,3-epoxysqualene-cycloartenol cyclase; 2,3-oxidosqualene-cycloartenol cyclase; (S)-2,3-epoxysqualene mutase (cyclizing, cycloartenol-forming)