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MEASUREMENT OF THE DURATION OF DNA SYNTHESIS IN ERYTHROID CELLS OF THE BONE MARROW USING A DOUBLE LABELLING AUTORADIOGRAPHIC TECHNIQUE DESIGNED SPECIFICALLY FOR USE WITH HAEMOPOIETIC TISSUES

This paper describes a double labelling autoradiographic technique for use with haemopoietic tissues. In involves two photographic emulsions separated by a thin piece of mica on which the cells have been smeared. In this way the autoradiographic grains due to tritium and carbon‐14 appear above and below the cells respectively.