Abstract
Groups of young rats were maintained for 90 days on otherwise adequate diets containing about 10% of cereal protein and supplemented with a wood sugar yeast or a brewery bottom yeast. Their growth was inferior to that of rats receiving a diet containing milk protein. Addition of cystine corresponding to 2% of the proteins in the yeast diets greatly improved the growth; in the case of rats receiving the brewer''s yeast this was equal to that produced by the standard diet. The often fatal liver and kidney lesions which developed on the yeast diets were prevented by the cystine. S-poor proteins such as casein produced the same symptoms.

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