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Fig. 5 Presence of supernumerary Mauthner axons does not affect oligodendrocyte number or distribution. (A-C) Lateral views of the spinal cords in Tg(mbp:EGFP)-expressing wild-type (A), notch1a morphant (B) and hoxb1 mRNA-injected (C) animals shows that oligodendrocyte number and distribution are not affected by the presence of supernumerary Mauthner axons. Arrows point to oligodendrocytes in the dorsal spinal cord with projections to the ventral spinal cord. Compare with Fig. 7B. Scale bar: 20 μm. (D). Total oligodendrocyte number per 425 μm length of tissue in the mid-trunk spinal cord of wild-type, notch1a morphant and hoxb1 mRNA-injected animals and, in grey, the number of oligodendrocytes specifically located in the dorsal domain of the spinal cord. Error bars represent s.d.