Methylputrescine as possible precursor of nicotine in Nicotiana rustica.
D000596:Amino Acids / Q000378:metabolism*; D002247:Carbon Isotopes; D008697:Methane / Q000378:metabolism*; D009538:Nicotine / Q000096:biosynthesis*; D009584:Nitrogen; D010947:Plants, Toxic; D011868:Radioisotopes; D014026:Nicotiana / Q000378:metabolism*
D000596:Amino Acids; D002247:Carbon Isotopes; D011868:Radioisotopes; D009538:Nicotine; D009584:Nitrogen; D008697:Methane