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In the presence of serum-containing medium, BHK cells attached and spread during a 1-h period onto a 3-5 nm thick serum layer absorbed on the substratum surface. The closest approach of the plasma membrane to the serum layer was observed to be about 9nm, which was determined by tilting the sectioned cells in a goniometer holder. Bundles of microfilaments or(More)
The distribution and mobility of anionic sites on the surfaces of baby hamster kidney cells were studied by utilizing the multivalent ligand, polycationic ferritin, as a visual probe. Our observations revealed that anionic sites are distributed over the entire cell surface, with the highest density of sites being located on cell surface microextensions. (More)
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