PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
1896431-5	1991	The significance of some changes in the catalytic site is uncertain due to the intrusion of a symmetry related Lys-70 side chain which hydrogen bonds to both Asp-21 and Glu-43.	Hydrogen	135-143	beta-secretase 2	Homo sapiens	158-164