PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
12972262-3	2003	More specifically, the environment around the Asp21-Lys29 ion pair has been altered through mutations at position 25, which is an asparagine in mammalian ubiquitin and a positively-charged residue in many other ubiquitin-like proteins.	Asparagine	130-140	beta-secretase 2	Homo sapiens	46-51