PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 30833751-6 2019 Biochemical analysis demonstrates that QPCTL is critical for pyroglutamate formation on CD47 at the SIRPalpha binding site shortly after biosynthesis. Pyrrolidonecarboxylic Acid 61-74 leukocyte surface antigen CD47 Cricetulus griseus 88-92