Docking sites on substrate proteins direct extracellular signal-regulated kinase to phosphorylate specific residues.
Fantz DA, Jacobs D, Glossip D, Kornfeld K, J Biol Chem, 2001 Jul 20 - link

Multiple docking sites on substrate proteins form a modular system that mediates recognition by ERK MAP kinase.
Jacobs D, Glossip D, Xing H, Muslin AJ, Kornfeld K, Genes Dev, 1999 Jan 15 - link