PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 7781173-5 1995 When rats were exposed to high levels of mercury vapour during early embryonic development there was a significant (62%) increase in hippocampal NGF levels at P21 accompanied by a 50% decrease of NGF in the basal forebrain. Mercury 41-48 KRAS proto-oncogene, GTPase Rattus norvegicus 159-162