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Gentamicin resistance occurs in most strains that carry the SCCmec type II element but is conferred by the aac6'-aph2" gene elsewhere on the chromosome and is frequently carried by transposon Tn4001 (11,16). Genetic changes can be brought about by transposons rearranging the genome--often in response to changes in the environment (bacteria). The results of a study of the patterns of a certain type of genomic change, called transposon insertions, among thirteen vertebrate species supported an earlier proposal of evolutionary trees showing that primates (human, chimpanzee, baboon) are more closely related to rodents like the mouse and rat than to carnivores like the cat and dog or artiodactyls like the cow and pig. |
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