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First, 293 cells stably expressing Moloney gag and pol under control of cytomegalovirus (CMV) promoter-enhancer were transiently transfected by CaPO4 precipitation with 20 ug of pLXSN retroviral vector and 5 ug of the plasmid pMDG containing the vesicular stomatitis virus (VSVg) envelope downstream of the CMV promoter-enhancer.
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either viable, apoptotic, or necrotic when analyzed by staining morphology. Counting was performed blind, meaning that each slide was given a number and the identity of each sample was not known during counting. The counting procedure made use of a light microscope at a magnification that allowed the incorporation of about 100 cells per field. Five fields were counted per slide, and each experimental condition was performed two times.

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