PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 7646057-8 1995 Analysis of the products synthesized by purified FPGS, however, suggests that while addition of the first gamma-Glu to beta,beta-F2MTX is highly efficient, subsequent additions occur at a negligible rate; this premise was confirmed by directly comparing the in vitro FPGS substrate activity of MTX-gamma-Glu and beta,beta-F2MTX-gamma-Glu. gamma-glu 106-115 folylpolyglutamate synthase Homo sapiens 49-53