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Fig. 4. Zebrafish embryos express Hh ligands during the period of oligodendrocyte specification. All panels show transverse sections through trunk spinal cord (sc), with dorsal upwards. (A) Notochord (nc), medial floor plate (mfp) and lateral floor plate (lfp) express shh at 36 hfp. (B) At 48 hpf, medial floor plate and notochord express shh. (C) Medial floor plate also expresses twhh at 36 hpf and (D) 48 hpf. Scale bar: 20 µm.





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