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The presence of 1-tryptophan decreases the rate of intestinal absorption of L-histidine in the rat. The absorption rate of 1-tryptophan does not appear to be affected by the simultaneous presence of histidine. Dl-phenylalanine and L-arginine do not seem to affect significantly the absorption of either histidine or tryptophan.
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Pinsky et al. (1952) studied this question.
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