... shiftedbands (X and Y) . As bands X and Y were only partiallyinhibited by 500-fold excess of unlabelled wild-type oligo-nucleotide, we propose that the proteins involved in thesecomplexes have very ... tyrosine kinases and phosphatasesare the key players in the regulation of protein tyrosinephosphorylation. Among the known protein tyrosinephosphatases, SHP-1 and SHP-2 are distinguished by ... Biology, Toronto Western Research Institute, University Health Network, Toronto, Ontario,Canada;2Laboratory of Gynecologic Oncology, Department of Obstetric Gynecology and Reproductive Biology,...