PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 1639064-0 1992 The human p50csk tyrosine kinase phosphorylates p56lck at Tyr-505 and down regulates its catalytic activity. Tyrosine 58-61 C-terminal Src kinase Homo sapiens 10-16 1639064-4 1992 Here we characterize a human cytosolic 50 kDa protein tyrosine kinase, p50csk, which specifically phosphorylates Tyr-505 of p56lck and a synthetic peptide containing this site. Tyrosine 113-116 C-terminal Src kinase Homo sapiens 71-77