€¦ · In 1944 Oswald Avery, Colin McLeod and Maclyn McCarty (U.S.A. ) proved that there is a...
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€¦ · In 1944 Oswald Avery, Colin McLeod and Maclyn McCarty (U.S.A. ) proved that there is a connection between nucleic acid and heredity. In 1953 James Watson (U.S.A.) and Francis