Sister group
closest relative(s) of another given taxon in a phylogenetic tree From Wikipedia, the free encyclopedia
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A sister group or sister taxon is a term used to describe the closest relatives of an organism (or other taxon) in a phylogenetic tree.[1] It is a term in cladistics.
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The sister group of organism A is B. The sister group of the clade B+A, is C.
References
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