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Immunoelectron microscopy of ultrathin cryosections. Labeling of srcts NRK cells cultured at the permissive temperature with PY14. (A) Caveolae (double small arrows) as well as the flat plasma membrane (arrowheads) are decorated. Aggregated caveolae and/or vesicles found relatively near the cell surface (B–E) or in the deeper cytoplasm (F–H) are also labeled heavily. Some of them are as small as caveolae, but others are apparently larger than caveolae (single arrows). Bar, 100 nm.
