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One more point to add about isotype controls (forgetting just now the issue of
>how good an isotype control is if one knows neither its concentration nor its
>F/P ratio):
>While it is probably OK to batch isotype controls if one is concerned simply
>with finding the percent of cells in a population that are positive for a given
>marker (and that marker is clearly brighter than the batched isotype controls)
>-- it is probably *not* OK to batch isotype controls if one is concerned with
>the intensity of the stained cells (and one is intending to subtract the
>isotype control intensity from the intensity of the positive cells).
>
>Because of all these problems, I believe I have heard that the latest US
>clinical guidelines will recommend that isotype controls are not necessary
>(i.e. a waste of time and money ?). Perhaps some clinical people can confirm
>this for the network.
>
>Yet Again,
>Alice Givan
Gerald E. Marti
Flow and Image Cytometry Section
Laboratory of Medical and Molecular Genetics
Division of Cell and Gene Therapies
CBER FDA NIH Bdg 29B Rm 2NN08
8800 Raockville Pike
Bethesda,MD 20892
301-827-0453 (voice)
301-827-0449 (fax)
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