PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 11909625-1 2002 Putrescine:SAM N-methyltransferase (PMT) catalyses the N-methylation of the diamine putrescine to form N-methylputrescine, the first specific precursor of both tropane and pyridine-type alkaloids, which are present together in the roots of Duboisia plants. pyridine 172-180 putrescine N-methyltransferase 3 Nicotiana tabacum 36-39