title: Nathan Zuntz and 100 years non-protein-nitrogen research in Berlin.
mesh_terms: D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D049672:History, 19th Century; D009584:Nitrogen / Q000378:metabolism*; D009751:Nutritional Requirements; D010827:Physiology / Q000266:history
chemical_list: D009584:Nitrogen