Fig. 4. Ngf, Lanr, Gdnf, Ncam and Net3 expression is not altered in the Sema3a^-/- tooth. Bright- and dark-field images of frontal sections of the E14-late bud/early cap stage wild-type (A1-A2,C1-C2,E1-E2,G1-G2,I1-I2) and Sema3a mutant (B1-B2,D1-D2,F1-F2,H1-H2,J1-J2) upper and lower first molar tooth germs. Abbreviations: de, dental epithelium; dp, dental papilla. Scale bar: 100 µm.