PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 29412638-2 2018 To date, there are no studies available in the literature on 18F-labeled 6 S- and 6 R-5-MTHF radiotracers for imaging folate receptor (FR)-alpha-positive tissues. 6 s- and 6 r-5-mthf 73-92 folate receptor 1 (adult) Mus musculus 118-144