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The schematic model of K+ circulation in mouse cochlea. K+ exits from HCs into the perilymph and is reabsorbed by the SCs and is further transported to the spiral ligament of the cochlear lateral wall through epithelial tissue gap-junction network. K+ is then reabsorbed by type II and IV fibrocytes, and recycled to the stria vascularis where it is finally secreted into the endolymph. HC, hair cell; SC, supporting cell; OSC, outer sulcus cell; BV, blood vessels.
