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All nitrogen-containing compounds synthesized in the body derive their nitrogen from amino acids cellular proteins, hormones (e.g., thyroxine, epinephrine, insulin), neurotransmitters, creatine phosphate, heme in hemoglobin and cytochromes, melanin, purine and pyrimidine bases

KMJ-Kuwait Med J 46(1):3243 Cederbaum AI (2008) CYP2E1Biochemical and toxicological aspects and role in Alcohol-Induced Liver Injury

So I feel like, again, this article is a really nice resource so that you can start to become better at explaining why someones back hurts

5th Ed., Elsevier, 2022

Carskadon, M

Vitamin D affects an impressively wide range of physiological functions including male fertility