Abstract
In the adrenal gland of Siren lacertina three types of chromaffin cells are described, on the basis of size, shape and electron density of the cytoplasmic granules: adrenaline-secreting cells, noradrenaline-secreting cells and small granulated chromaffin-cells. In A-cells exocytotic profiles are described, in which the granule membrane fuses with the plasma membrane and the granule core is discharged into the intercellular space.
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