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Confocal immunofluorescence of Na/K-ATPase (β1 isoform) and Claudin-11 in the lateral wall of the basal and apical (inset) turns. Claudin-11 is expressed basally from the superior epithelium of the SP to the suprastrial space insulating the K+ secreting marginal cell layer. Non-polarized β1 Na/K-ATPase activity is high in type II and type V fibrocytes conceivably reflecting the uptake and recirculation of K+. RM, Reissner’s membrane.
