Differentiation of Unidentified Chick Growth Factors in Liver

Abstract
Experiments have been completed the results of which showed that chicks require for normal growth two factors present in liver not identical with any nutrient previously reported to be needed. Both factors were found to be present in a 70% ethanol extract of the concentrated water-soluble material of liver. The results of counter-current distribution indicated that one of the factors is organic in nature and the other probably inorganic. Evidence was also obtained of the presence of a third chick growth factor in fish solubles.