Abstract
The ultrastructure of some probable sites of release of materials from axons of neurosecretory cells is described. The sites comprise clusters of small pale vesicles adjacent to the plasma membrane with electron-dense material and neurosecretory granules associated with them. These sites were found in some axons in which the plasma membrane is adjacent to the basement membrane and in other axons in which the plasma membrane is contiguous with the plasma membrane of cells of the corpus allatum and with other axons containing neurosecretory granules.
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