ConclusionGelatin will not allow optimum growth even when supplemented with all reported essential amino acids. In fact, less growth is obtained with gelatin plus amino acids than with the amino acids alone at the same level in the diet. 2. The presence of 6% glycine of 5% dl-phenylalanine or 5% 1-proline in certain diets has an inbibitory effect on growth. 3. The inhibitory effect of glycine and praline on growth may explain the difficulty in supplementing gelatin for optimum growth.
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