Expression of neural markers is affected in P2-MO-injected embryos. The expression of the neural markers wnt1 (A, B) and ngn1 (C–H) was analyzed in ST-MO- and P2-MO-injected embryos by WISH with specific probes. A, B, E, H dorsal views; C–F lateral views. Abbreviations: dd, dorsal diencephalon; tel., telencephalon; tg, tegmentum; mhb, midbrain–hindbrain boundary; hb, hindbrain; dh, dorsal hindbrain.