all-trans-lycopene + 2 AH2 => all-trans-zeta-carotene + 2 A
all-trans-lycopene + 2 ah2 => all-trans-zeta-carotene + 2 a
all-trans-lycopene + 2 AH2 => all-trans-zeta-carotene + 2 A
all-trans-lycopene + 2 ah2 => all-trans-zeta-carotene + 2 a