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A method for studying the three‐dimensional organization of cytoskeletal elements of cells: improvements in the polyethylene glycol technique

A method utilizing polyethylene glycol (PEG) as an extractable embedment for electron microscopy is described. Tissues are fixed according to conventional protocols, embedded in PEG, and sectioned. Sections (ranging from 100 to 500 nm in thickness) are mounted on grids, divested of their PEG matrix, critical‐point‐dried, and examined stereoscopically. This method greatly facilitates studies on the three‐dimensional organization of cytoskeletal and cytoplasmic contractile systems in both muscle and nonmuscle cells.