PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
12644256-4	2003	Among them, two enzymes, EXT1 and EXT2, catalyze polymerization of glucuronic acid and N-acetylglucosamine, the crucial step of HS synthesis.	Glucuronic Acid	67-82	exostosin glycosyltransferase 2	Mus musculus	34-38