the dam-2 mutant strain exhibits a level of sensitivity to 2-aminopurine ( 2ap ) intermediate between that of the dam+ and the dna adenine methylation-deficit dam-1 strain , and 2ap sensitivity was reversed by introduction of a muth mutation or of the plasmid pmq148 ( which carries a functional escherichia coli dam+ gene ) .
C0025723
methylation
C1334751
dam