PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
6630204-7	1983	Thin layer chromatography of a base hydrolysate of [35S]O4-labeled C4 alpha-chains, or C4 isolated from human plasma, revealed the presence of tyrosine-O-sulfate.	tyrosine O-sulfate	143-161	complement C4A (Rodgers blood group)	Homo sapiens	67-75	
23592783-8	2013	The transition from zymogen to active C1s repositions both loops such that they would be able to interact with sulfotyrosine residues on C4.	tyrosine O-sulfate	111-124	complement C4A (Rodgers blood group)	Homo sapiens	137-139