acitretin alitretinoin allophycocyanin alpha-carotene american cancer society anthocyanidin anthocyanin anthoxanthin antioxidant apocarotenal asbestos astaxanthin basf beta-carotene betalain bexarotene broccoli canthaxanthin carotenoid carrot cassava cell wall chard chlorophyll citranaxanthin cochrane collaboration cognis collard greens conjunctiva crocetin crocin cryptoxanthin digital object identifier dunaliella salina etretinate fenretinide flavoxanthin fruit fucoxanthin greek alphabet green grignard reaction industrial biotechnology international unit isomer isoprene isotretinoin jaundice journal of the american medical association kale liver lung cancer lutein lycopene mango medical subject headings medical sign national cancer institute parsley peridinin photosynthesis photosynthetic pigment phycocyanin phycoerythrin phycoerythrocyanin phytofluene portugal proanthocyanidin provitamin pumpkin reference daily intake retinal retinoid retinol rhodoxanthin romaine lettuce rubixanthin rule of thumb small intestine smoker sphingomonas spinach tannin tazarotene terpene thyme tobacco smoking total synthesis tretinoin united states department of agriculture university of bristol vegetable violaxanthin vitamin a vitamin e watercress winter squash wittig reaction xanthophyll yellow zeaxanthin