Abstract
Cells grown on type AM 6 Alpha Metricel Gelman filter membranes are fixed 1-2 min with OsO4 vapor, washed in distilled water, dehydrated 4 min in 95% and 4 min in absolute ethanol. They are then stained for 2 min in a 1:1 dilution of Giemsa stock solution and an approximately neutral, low mineral content tap water. The stain is removed from the filter by 1 min in 50%, 1 min in 95%, 1 min in absolute ethanol and 1 min in a mixture of absolute ethanol and xylene 1:1. The filter is finally cleared in xylene and mounted with a synthetic resin. This procedure gave polychrome staining on neonatal thymic cells from C57 black pedigreed mice and on human leucocytes, with little or no stain retained by the filter membrane.
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