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 => all-trans-lycopene + 2 ah2