Fig. 5. Lingual innervation at E13 and E14. PGP 9.5 immunofluorescence (left column) and Nomarski image overlays (right column) showing the extent of papillary innervation. (A-D) from an E13 embryo, developing (A,B) fungiform and (C,D) circumvallate papillae. The lingual epithelium is not innervated at this time. (E-H) E14, developing (E,F) fungiform and (G,H) circumvallate papillae. Nerve fibers have reached the basement membrane below the forming papillae. Scale bars: 50 µm.
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