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most closely related wild cousins,the group found that many parts of the house sparrows'genome(基因组)appeared to have experienced positive selection,meaning certain gene variations likely helped the birds live alongside humans.The most signifi- cant sign of positive selection in the birds'DNA was found in a part with two genes:one linked to skull development and the other that helps create the enzyme amylase(淀粉酶).Changes to both genes have helped the house sparrows eat human-grown foods. "The house sparrow could carry more copies or a different copy of the skull shape gene and the amylase gene,"Ravinet says.His team plans to more closely study the variations in both genes,as it's not clear yet how these genes have changed the birds'appearances and behavior.And they will also e examine