Mammalian production of N2?
D000818:Animals; D005243:Feces / Q000032:analysis; D005856:Germ-Free Life; D006801:Humans; D008322:Mammals / Q000378:metabolism*; D051379:Mice; D009584:Nitrogen / Q000378:metabolism* / Q000652:urine; D012119:Respiration
D009584:Nitrogen