Ultrametric tree

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A tree with equal root-to-tip path lengths for all lineages, for example one built with the assumption of a molecular clock.

Itai Yanai, Molecular Genetics Department, Weizmann Institute breaks it down like this:

"An additive tree is one where along with the topology of the tree edge lengths are also specified corresponding to distances among the organisms. An ultrametric tree is a special kind of a rooted additive tree where the terminal nodes are all equally distant from the root."

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