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Figure Caption
Fig. 4 Light micrographs of M-axon caps in the axolotl larva. Both show transverse sections of the left side of the brain at the M-cell level (lesions made at stage 35); dorsal is to the top. (A) M cell (M) survived the lesion, and its axon (arrow) passes through the axon cap (ac) normally. (B) M cell was deleted. The cap neuropil (ac) is present at the correct position; it stains less densely than does the normal axon cap. (Scale, 50 μm; Rowell silver stain; bright-field illumination with X40 objective.)
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Full text @ Proc. Natl. Acad. Sci. USA