Even if the beads were magnetic, most of the valves used in flow cytometers are made of non-ferrous ie brass or Stainless steel which if there is enough alloy in them, they are also "non ferrous" Charles A. Kuszynski, Ph.D. Assistant Professor/Director Cell Analysis Facility University of Nebraska Medical Center 986495 Nebraska Medical Center Omaha, NE 68198-6495 402 559-6267 voice 402 559-4077 fax ckuszyns@unmc.edu
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