Immunoreactivity for Flt-1 and Flk-1 in the cochlea. (A-C) Flt-1 expression (green) was detected n the cochlear sensory epithelium (A; I, inner hair cell; O, outer hair cell; D, Deiter's cell; C, Claudius' cell), spiral ganglion neurons (B; SG) and spiral ligament (C; ligament). (D-F) Flk-1 expression was found in the cochlear sensory epithelium (D), spiral ganglion neurons (E), spiral ligament (F) and stria vascularis (F; SV). Nuclei were labeled with DAPI. The specimens were viewed with 63× oil objective. Scale bar = 200 μm.