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Semaphorin - Neuropilin repulsive signaling works synergistically with the forward EphB signaling to guide neural crest cells down the rostral half of somites in mice; in chick embryos, semaphorin acts in the cephalic region to guide neural crest cells through the pharyngeal arches.<unk> Semaphorin - Neuropilin repulsive signaling works synergistically with the forward EphB signaling to guide neural crest cells down the rostral half of somites in mice; in chick embryos, semaphorin acts in the cephalic region to guide neural crest cells through the pharyngeal arches.<unk> Semaphorin - Neuropilin repulsive signaling works synergistically with the forward EphB signaling to guide neural crest cells down the rostral half of somites in mice; in chick embryos, semaphorin acts in the cephalic region to guide neural crest cells through the pharyngeal arches.<unk>