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1143. Letter from Joshua Lederberg to David M. Bonner

1144. Letter from W. T. Sedgwick to Albert F. Blakeslee

1145. Enzyme Experiments

1146. Letter from George W. Beadle to Joshua Lederberg

1148. Genetic Evidence for Sex in Bacteria

1149. The Restoration of the Liver

1150. The Theory of Fixation