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Text File  |  1999-06-07  |  212 b   |  4 lines
  1. FIGURE  23.1-1. Structures of  selected retinoids and  the carotenoid,
  2. beta-carotene.  Retinol, 13-cis-retinoic  acid  and beta-carotene  are
  3. naturally occurring; 4-HPR and etretinate are synthetic retinoids.
  4.