PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 12496936-2 2003 Previous work in rats has shown that cues associated with morphine, cocaine, nicotine or palatable food can elicit enhanced expression of the immediate-early gene product Fos in discrete brain regions. Nicotine 77-85 Fos proto-oncogene, AP-1 transcription factor subunit Rattus norvegicus 171-174