PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
19131246-2	2009	Additionally, the prodrug contains a 1,6-self-immolative spacer coupled to the dipeptide Phe-Lys that acts as a substrate for cathepsin B.	Dipeptides	79-88	cathepsin B	Homo sapiens	126-137