ID 1.3.99.26 DE all-trans-zeta-carotene desaturase. AN 2-step phytoene desaturase. AN phytoene desaturase. CA 2 A + all-trans-zeta-carotene = 2 AH2 + all-trans-lycopene. CC -!- This enzyme is involved in carotenoid biosynthesis. DR Q02861, CRTI_MYXXA ; //