... peptides The level of PKC a, b1, b2 and f isoforms was also studied Results Synthesis of peptides derived from PKI55 and their inhibitory effect on rat brain PKC A series of peptides was synthesized ... inhibition of the PKC a, b1, b2, c, d, e and f isoform enzyme activity in the presence of the PKI55 protein and the derived peptides 5, and 9, all tested at a concentration of lM The data are the mean ... peptides derived from PKI55 on PKC isoforms Results obtained in a previous study of the inhibition properties of PKI55 protein on human recombinant PKC isoforms [13] were confirmed in the present study...