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Immunostained 5-HT neurons extend ventrally from the region of the raphe pallidus (midline) (A) along the ventral surface of the pyramids (B) in the human infant medulla (37). Abbreviations: pyr, pyramid; VMS, ventral medullary surface. A. 4×, scale bar = 200 μm. B. 10×, scale bar = 80 μm. Reprinted from (23) with permission from Elsevier.
