Ornithine as a precursor for the pyrrolidine ring of nicotine.
D000596:Amino Acids / Q000378:metabolism*; D001669:Biochemical Phenomena; D009538:Nicotine / Q000378:metabolism*; D009952:Ornithine; D011759:Pyrrolidines
D000596:Amino Acids; D011759:Pyrrolidines; D009538:Nicotine; D009952:Ornithine; C032519:pyrrolidine
AMINO ACIDS/metabolism; NICOTINE/metabolism