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1 ﹒ AveryO T，MacLeodC Ma ndM cCarty M ． Studies on the chemical nature of the substanceinducingt ransform a tion of pneumococcal types ． Induction of transfor mation bya d eoxyribonucleic acid fraction isolated from Pneu mococcus type Ⅲ J Exp Med。4.Watson ......