However, ongoing innervation of cochlear sensory cells was identified using peripherin labeling ( Fig. 5E ; see Simmons et al. 1996; Hafidi 1998; Huang et al. 2007) or for olivocochlear efferents that were identified by labeling for calcitonin gene-related protein (CGRP; Fig. 5F , Fritzsch 2003). By E18.5, the SG a7 GFP signal was present in afferent processes that extend to the base or near vicinity of the IHCs (Fig. 5G) .