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[Ultracytochemical studies on leukemic cells].

The present survey of ultracytochemical investigations in the cells of the Graffi and Rauscher leukaemic systems is intended to throw a light on the place of replication and on the incorporation of cell specific material into the virus. The successful evidence of incorporating certain enzymes associated to the membrane into the virus envelope could have a significance in so far as this process can be used to explain the appearance of cytotropism in certain kinds of virus to a target cell.