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Figure Caption
Fig. 3 Electron micrographs of margins of normal (A) and M-cell deleted (B) axon caps. The thin sections were made after the caps shown in Figs. 1 and 2 (right side, M-cell deleted) were reembedded. Axo-axonal chemical synapses (s), including symmetrical synapses (ss), are present. Cytoplasmic extensions of the cap cells (c) form a lamellar structure surrounding the cap neuropil (arrows). The structure of the neuropil closely corresponds to the "core" portion of the axon cap of the adult goldfish described by Kohno (14); a "periphery" portion is absent in the zebrafish larva. (Scale, 1 μm.)
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Full text @ Proc. Natl. Acad. Sci. USA