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retinoic acid C 20H 28O 2 Retinoic acid (RA), also called vitamin A acid,
tretinoin, is a natural acidic metabolite of vitamin A produced by the body.
It plays a critical role in normal development, growth and differentiation
of cells by modulating the expression of target genes. It affects the growth of bones and the
metabolism of the epithelium (outer skin). C
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