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FIG. 1.— One NJ agglomeration step. In the current tree (a), the taxon set contains a, b, c, d, e, f, and g; some are original taxa, whereas the others (i.e., a, f, and g) correspond to subtrees built during the previous steps. Tree (b): after selection of the (f, g) pair, a new subtree is built, and both f and g are replaced by a unique taxon denoted as u. NJ terminates when the central node is fully resolved.
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