This peptide, Biotin-Ahx-GGMEDIYFEFMGGKKK, identified by screening a degenerate peptide library, is a substrate for several kinases, including HER-2/c-neu/erb-B-2, Tie-2, cFMS, and cKit.

The biotin allows peptide to be used in kinase assays with streptavidin-bound membranes.