PE will give about a log better distinction between negative and positive as compared to FITC when using BD bech top machines. Rhesus macaques almost always have very dim CD4 staining, you really need to use your brightest channel to detect it well. They usually stain about a log dimmer than humans, the occasional monkey does stain as bright as human. Simon Monard Trudeau Institute Algonquin Avenue Saranac Lake NY12983 518 891 3080 X162
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