Selection on horizontally transferred and duplicated genes in sinorhizobium (ensifer), the root-nodule symbionts of medicago.

In both species, there was a highly significant negative correlation between the population frequency of a gene and the median size of the spatial cluster in which it was found ( S. meliloti : r df = 10,176 = −0.17, S. medicae : r df = 4,481 = −0.15, both P < 0.0001).

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