"The intestinal villi in the upper left picture (VAD) are from Vitamin A deficient rats. The villi in the lower left (VAS) are from Vitamin A sufficient rats. The villi in the lower right (VASUP) are from rats given extra supplemental Vitamin A. The villi become short and thick when the rat is deficient in Vitamin A, impairing nutrient absorption. (Source: Zaiger G, Nur T, Barshak I, Berkovich Z, Goldberg I, Reifen R. Vitamin A exerts its activity at the transcription level in the small intestine. Eur J Nutr (2004) 43:259-266.)"
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