Rough endoplasmic reticulum and Golgi in the epidermal cell of Fundulus heteroclitus scale. Endoplasmic reticulum studded with protein-manufacturing ribosomes form a continuous network along the periphery of this section of the cell. Along the surface of some of the ER folds are energy-generating mitochondria. Deeper into the cell are stacks of cisternae forming the Golgi. Vesicles packaged by the Golgi are visible at the peripheries of these stacks and are found scattered throughout the cytoplasm.
Fundulus heteroclitus scales were chemically fixed with 2.5% glutaraldehyde, 2% formaldehyde in 0.1M cacodylate buffer (pH 7.3), then post-fixed in 4% osmium tetroxide and stained en bloc in 1% uranyl acetate. The scales were then dehydrated in a graded series of ethanol and infiltrated with Spurr’s resin. Thin sections of 70 nm were trimmed using a diamond knife and post-stained in uranyl acetate and lead citrate. This micrograph was imaged using a Phillips CM 100 transmission electron microscope at an accelerating voltage of 80 kV.
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