You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Xanthurenic acid is the metabolic end product of? and explain in detail?
In the major catabolic pathway of tryptophan, kynurenine is an enzyme dependent on pyridoxal phosphate. Therefore in Vitamin B6 deficiency, the pathway at this level is blocked. The accumulated kynurenine is shunted to Xanthurenic acid and is excreted in urine. Ref: Textbook of Biochemistry DM Vasudevan, 5th Ed, page 208