PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 9232131-0 1997 Assessment of cytochrome P450 3A4 activity during the menstrual cycle using alfentanil as a noninvasive probe. Alfentanil 76-86 cytochrome P450 family 3 subfamily A member 4 Homo sapiens 14-33