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METABOLISM OF GLUTAMIC ACID 135 of glutamic acid from glucose, and hence from carbohydrates, may be appreciable. Aspartic acid accounts for about one-third of the activity in the hydrolysate. The specific activity in aspartic acid is considerably greater than that of glutamic acid. This suggests that, though a small amount of aspartic acid may be synthesized from glucose through glutamic acid, the major portion is formed directly. SUMMARY
A. S. McFarlane (1956) studied this question.