Page "Cairina" Paragraph 6
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Analysis of the mtDNA sequences of the cytochrome b and NADH dehydrogenase subunit 2 genes ( Johnson & Sorenson, 1999 ), meanwhile, has indicated that this is probably not correct, and that moreover the two species usually united in Cairina are not even closely related to each other, which is also suggested by the biogeography of their distribution:
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