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“Short- and long-term STZ treatment triggered marked decreases in plasma total TRP and hypothalamus TRP levels but the diabetogenic agent diminished 5-HT metabolism in the 1-week ST-treated rats only.”
The International journal of biochemistry • 1986 | View Paper
“ Streptozotocin-injected rats, kept on niacin-deficient diet and given a dose of L-tryptophan (intraperitoneal or oral) excreted comparatively less quantities of niacin and N1-methylnicotinamide in urine than the control nondiabetic rats.”