Abstract
Ansbacher1 has reported that p-amino benzoic acid would cure the characteristic graying of areas of the pelage of rats maintained on a vitamin B deficient diet supplemented with thiamin hydrochloride, riboflavin, pyridoxin hydrochloride, calcium pantothenate, nicotinic acid, inositol and choline chloride. On the appearance of this paper a considerable number of characteristically grayed rats were available to us for experimentation. They had been raised on a somewhat different ration than that employed by Ansbacher, for they received a vitamin B deficient diet supplemented with only three substances, to wit: thiamin hydrochloride, riboflavin and pyridoxin hydrochloride. They were divided into four groups as follows:(1) Controls: Animals continued on the same diet and supplements which had produced the graying.(2) Animals receiving daily, in addition to the 3 supplements mentioned, 100 μg pantothenic acid.(3) Animals receiving daily, in addition to the 3 supplements mentioned, 3 mg of p-amino benzoic acid....
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