Peptide selected from a random combinatorial peptide library that is also a much more specific and efficient substrate for the Src-family protein tyrosine kinase than cdc2 (6-20). Its Km value for p60 c-src (55 MicroM) is about 6.4-fold lower than that of the cdc2 (6-20) substrate. MW: 877.02 Da. Purity >98 % purified