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Fig. 4. Stereociliary bundles of vestibular hair cells of
mgRb:Rb-/- mutants at birth, as shown by
espin-immunostaining. (A) Espin is localized to HC stereocilia of control
utricules. (B) In mutants, espin-positive HCs are situated throughout the
thickened utricular sensory epithelium. Several HCs at the surface show
abnormal bundles. (C,D) High magnification views show HCs with aberrant
stereocilia in the utricle and in the adjacent mesenchyme (arrow) of mutants.
(E,F) In contrast to controls, mutants show espin-stained HCs at different
levels of the ampullary sensory epithelium. HCs in the mesenchyme are also
espin positive (arrow). (G,H) In addition to the distinct bundle
abnormalities, stereociliary bundle morphologies comparable with controls are
seen in some HCs of mutants, especially in ampullae. Abbreviations: wt, wild
type; ut; utricle; amp, ampulla; SE, sensory epithelium; ME, mesenchyme; LU,
lumen. Scale bar: 70 µm for A-F; 60 µm for G,H; 30 µm for C,D.