It was found that a slide centrifuge (Cytospin) preparation of a cell suspension allowed a reliable assessment of not only cell structure but also the percentage of non-viable cells. The non-viable cells appeared as "smear" cells and paralleled in number the cells taking up trypan blue. Direct experiment showed the unstained viable cells in a trypan blue cell suspension remained intact in a Cytospin preparation while the cells taking up trypan blue were the "smear" cells. The non-viability of the "smear" cells was confirmed by their inability to survive in culture.
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