Assertion: borrelia | /r/CapableOf | approach its lower limit
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text: It has been proposed that genomes have different G+C contents because of inherent species‐specific directionality of mutation and/or repair systems ( 123 ), and one might imagine that Borrelia , whose chromosome is 28.6% G+C, is approaching its lower ‘limit’ in that most new changes towards even lower G+C values would be selected against.