-Carotene

-Carotene is an isoprenoid found abundantly in carrots that is an accessory photosynthetic pigment and a precursor of all-trans-retinol (Vitamin A) (Figure 19.25).

-carotene + 2 NADH (or NADPH) + H⁺  <=> 2 All-trans-Retinol + 2 NAD⁺ (or 2  NADP⁺) (two reactions catalyzed by a dioxygenase and a reductase)

-Carotene is made in plants from lycopene.