DON W. FAWCETT / SCIENCE PHOTO LIBRARY DON W. FAWCETT / SCIENCE PHOTO LIBRARY
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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