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Light microscopy of the entire Rhinarium (a) and left narial pad (b) of an adult rat. (1) Dorsal integumental fold; (2) Crus superius of the narial pad; (3) horizontal groove; (4) external nasal opening; (5) Crus inferius of the narial pad; (6) ventral integumental fold; (7) median sulcus; (8) epidermal ridges. M, medial; V, ventral. Scale bars = 1 mm.
