Isolation and Nature of an Unidentified Growth Factor(s) in Condensed Fish Solubles

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Abstract
Both inorganic and organic compounds were involved in the growth response that was observed when chicks were fed diets containing condensed fish solubles. It appeared that the total growth response observed was due to both an inorganic and organic compound(s). The necessary inorganic constituents included copper and molybdenum. The growth promoting substance was extremely stable and completely dialyzable across a cellophane membrane. Considerable concentration of the factor was affected by dialysis followed by precipitation with methanol.