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SACMN extend dorsally directed axons towards and through the LEP. Schematic illustrating the axonal trajectory of SACMN and the SAN in the developing vertebrate spinal cord. BEN is selectively expressed on SACMN cell bodies and their axons, as well as on the SAN. D, dorsal, V, ventral, A, anterior, P, posterior, LEP-Lateral Exit Point; SAN-Spinal Accessory Nerve.
