417ity in older rabbits between 4-10 months of age increases only slightly during 11 days of starvation. In the younger 30-75-day-old rabbits, intraperitoneal injection of 0.5 g L-tryptophan per kg body weight induces the enzyme between 7to 15-fold over control values as compared to about 2-fold for 4-10month-old animals.
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