Larger proportions of Rho kinase and its substrate Mbs, the signaling unit that negatively regulates oligodendrocyte myelination, are phosphorylated at the onset of myelination, while their smaller proportions are phosphorylated in the later period cialis coupon As ERK1 and ERK2 reside downstream in the pathway, they represent a particularly attractive treatment strategy within the MAPK cascade that may avoid upstream resistance mechanisms