K-R-T-L-R-R

Lys-Arg-Thr-Leu-Arg-Arg (KRTLRR) is a hexapeptide. Lys-Arg-Thr-Leu-Arg-Arg is a substrate of protein kinase C from EGF receptor. Lys-Arg-Thr-Leu-Arg-Arg can be used to determine the activity of protein kinase C.