Deficiency of this vitamin can lead to squamous metaplasia in the bladder or cervix.
Deficiency of this vitamin can lead to squamous metaplasia in the bladder or cervix. Its acid form plays an important role in gene transcription, where this vitamin's receptor recognizes spaces of five nucleotides between AGGTCA sequences. An excess of this vitamin results in angular chelitis, and cryptoxanthin and the carotenes can provide equivalents to this vitamin. The 13-cis form of this compound is useful in treating icthyosis and other skin ailments, though it may also cause birth defects. Also known as isotretinoin, that isomer of the acid form of this vitamin is marketed as Accutane. Also important in both low-light and color vision, this fat-soluble vitamin is found in high amounts in liver and carrots. For 10 points, name this vitamin whose animal-derived form is known as retinol.
Deficiency of this vitamin can lead to squamous metaplasia in the bladder or cervix.
Vitamin A [prompt on retinol or any carotene before mention; prompt on all-trans retinoic acid or RA] 