Description of a coverslip holder for, and observations on, the critical point drying of cell cultures.

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The elimination of artefact during the preparation of cell cultures for scanning electron microscopy is difficult. Collapse of cellular projections, cytoplasmic cracks, perforations and fracturing of cell-cell processes and cell-substrate attachments occur during fixation, dehydration and critical point drying. Coating and storage may cause further artefact. A specimen holder which serves to minimize turbulence in the critical point dryer and which allows for the simultaneous processing of up to five coverslips, as well as a reproducible technique for the preparation of cell cultures are described.