PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 11296240-5 2001 Endonuclease cleavage, which is activated by the subsequent binding of the 3" terminal sequence of vRNA, resides in a PB1 sequence that contains three essential acidic amino acids, similar to the active sites of other enzymes that cut polynucleotides to produce 3"-OH ends. Acids 161-167 vault RNA 1-1 Homo sapiens 99-103