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Light microscopy of a coronal (a) and a tangential (b) slices of the rostral part of the rat snout stained for cytochrome oxidase activity. (1) Superficial slips of the Pars interna of the M. nasolabialis profundus; (2) Cupula nasi; (3) atrioturbinate; (4) Rhinarium; (5) nasal sidewall. A4 and B4, vibrissal follicles; RM, rostromedial; V, ventral. Scale bars = 1 mm.
