Election micrograph of the apical portion of parotid gland serous cells. The cells are polarized, with their product package within the secretory vesicles (SV) near the lumen (L) of the acinus. The cells display rough endoplasmic reticulum (rER) and several profiles of the Golgi apparatus (G). Immature secretory vesicles (IV) are present close to the Golgi apparatus. At the apical pole of the cells are junctional complexes (JC). The Intercellular space (IC) is dilated, and profiles of sectioned lateral plications are seen. M, mitochondria, x 15,000.
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