Colour enhanced transmission electron micrograph of cytoplasm of 3T3 cell showing typical 10 nm filaments (pink) coursing through the meshes of the endoplasmic reticulum. The 10 nm filaments follow a straight or gently curving course through the cytoplasm. They may occur individually or associated in loosely organized bundles. Shown here is their typical appearance in a cultured 3T3 cell.
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