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Vitamin R, Factor R

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Scientific name: Obsolete term for conjugated folic acid

Physiological role: Chicken growth factor


  1. Schumacher A, Heuser G, Norris L. The complex nature of alcohol precipitate factor required by the chick. J Biol Chem 1940; 135: 313–20.
  2. Combs Jr. G.F., 2012, “The Vitamins - Fundamental Aspects in Nutrition and Health - 3rd edition,” Academic Press; p. 517.
  3. Williams P., 2015, “The missing vitamin alphabet,” Nutrition & Dietetics [Web Reference]
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