Provitamin d3

... and is only expressed in the endosperm. phytoene synthase catalyzes the reaction that convertss two GGDP molecules to phytoene, the first step in provitamin - A synthesis." IS the gene Phytoene Synthase? is it both enzyme and a gene.

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... of Vitamin A are not enough to meet the daily requirements unless more than 5 pounds is consumed EVERY DAY. There is also no evidence that the provitamin in the rice can be absorbed and used in the body. There are other crops (dark green leafy veggies) that can be used to meet the dietary needs. ...

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