Hi, colleagues I need some help. When I perform the test for detection of cytoplasmic mu chain, I find the fluorescent signal of all cell populations (including granulocytes) is increased more than one log, so I can't determine whether the target cells' signal is really positive. I don't know what's the problem. I use the goat F(ab')2 anti-human IgM-PE (BioSource International, CA) and BD's Permeabilization solution. The procedures are according to BD's standard procedure manual. Any suggestion or comment will be helpful. Thanks in advance. Quehn Park, MD Department of Clinical Pathology Samsung Medical Center 50, Ilwon-dong, Kangnam-ku, Seoul, Korea, 135-710 E-mail : qbandal@hitel.net
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