I would agree with other commentators. You are probably observing endoduplicated cells. It is surprising how many cultures contain endoduplicated cells. Usually the person doing the experiments is unaware of this. A small percentage of such cells can have a dramatic effect on many measurements, cell survival after irradiation or drug treatment, for example. Michael Ormerod 34 Wray Park Road Reigate RH2 ODE Telephone: voice & FAX: (0)1737 241726 Web site: http://ourworld.compuserve.com/homepages/Michael_Ormerod
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