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