semar4dSemaphorin 4D (Sema4D) is a classic member of the semaphorin family involved in axonal guidance processes. The key effects of Sema4D in neurons are mediated by hh affinitySemaphorin 4D (Sema 4D) is an axon guidance molecule which is secreted by olodendrocytes and induces growth cone collapse in the central nervous system.By binding plexin B1 receptor