Labelling of plasma proteins with radioactive iodine.

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.