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We measured the in vivo incorporation of 2-aminopurine into DNA of T4 bacteriophage allelic for gene 43 (DNA polymerase), mutator (L56), 43+, and antimutator (L141). The magnitude of incorporation (mol/mol of Thy) was 1/1500 in L56, 1/1600 in 43+, and 1/8900 in L141. The incorporation ratio L56:43+:L141 in vivo was equal to that mediated by the purified DNA(More)