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Department of Animal Care, Columbia University, New York
Liver storage and blood levels of vitamin A in the rat have been investigated as influenced by specific factors used as supplements in a purified basal diet containing synthetic B vitamins instead of yeast. Under the conditions of our experiment commercial soybean lecithin markedly influenced storage and blood levels of vitamin A in the rat. Iodine interfered with this effect while heating of soybean lecithin interfered but little. The presence of an unknown factor in commercial soybean lecithin is indicated.