PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
27486831-2	2016	These structures often differ at the C3a position, which may be substituted with an oxygen, nitrogen, or sp(3)- or sp(2)-hybridized carbon.	sp(2)	115-120	endogenous retrovirus group K member 2	Homo sapiens	37-40