Structural model of Vitamin A1 (retinol) on the blackboard.

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Photo credit: © Jurgis Mankauskas / Alamy / Afripics
License: Royalty Free
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Keywords: a1, acid, background, blackboard, carotene, chalk, chemical, chemistry, element, formula, health, healthy, illustration, medicine, molecular, molecule, research, retinoic, retinol, science, scientific, structural, structure, tooth, vitamin, vitamins