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Ultracytochemistry of the synaptic ribbons in the rat pineal organ Krstic RCell Tissue Res 1976[Feb]; 166 (1): 135-43The synaptic complexes of the rat pinealocytes are neither cholinergic nor adrenergic. In the synaptic vesicles, a neurotransmitter carrier substance of lipid nature reacting with OsO4-Zn I2 mixture (similar to that present in both cholinergic and adrenergic vesicles) was not found. In addition, there were no indications of glucose-6-phosphatase or thiamine-pyrophosphatase activity in the synaptic vesicles. Thus, it appears that the synaptic vesicles do not originate from the rough or smooth endoplasmic reticulum. The synaptic ribbons do not contain carbohydrates, are of protein nature and possess some chemical resemblance to microtubules and microtubular bouquets. Appropriate ultracytochemical reactions have not shown detectable quantities of sodium and calcium ions in pinealocyte synaptic complexes.|Animals[MESH]|Calcium/analysis[MESH]|Glucose-6-Phosphatase/analysis[MESH]|Histocytochemistry[MESH]|Lipids/analysis[MESH]|Male[MESH]|Nerve Tissue Proteins/analysis[MESH]|Neurotransmitter Agents/analysis[MESH]|Organoids/analysis[MESH]|Pineal Gland/*analysis/ultrastructure[MESH]|Rats[MESH]|Sodium/analysis[MESH]|Synapses/*analysis/ultrastructure[MESH]|Synaptic Vesicles/analysis[MESH]|Thiamine Pyrophosphatase/analysis[MESH] |