PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 15919850-0 2005 Enantioselective metabolism and cytotoxicity of R-ifosfamide and S-ifosfamide by tumor cell-expressed cytochromes P450. r-ifosfamide 48-60 cytochrome P450 family 2 subfamily B member 6 Homo sapiens 114-118