Figure 6. Schematic representation of EAAT4 and EAAT5 expression in the mammalian vestibular neuroepithelium.

EAAT4 and EAAT5 are expressed in type I (right) and type II (left) hair cells and on the calyx inner face. EAAT4, but not EAAT5, is also expressed on the calyx outer face. EAAT5 may have a higher expression in type I versus type II hair cells. Both transporters are preferentially expressed in the subnuclear region of hair cells. EAAT1 is expressed in supporting cells [22].