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Basal cells in both the SE and the NSE are EGFR(+). The EGFR(+) cells form a continuous layer (A) around the periphery of the VNO. The SE basal cell somata (B) label heavily with the antibody (arrowheads) while the signal is at background level throughout the epithelium apical to the basal cell bodies (scale bars = 50 µm).
