15-cis-phytoene + A <=> all-trans-phytofluene + AH2
15-cis-phytoene + a <=> all-trans-phytofluene + ah2
15-cis-phytoene + A <=> all-trans-phytofluene + AH2
15-cis-phytoene + a <=> all-trans-phytofluene + ah2