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A phylogenetic tree, also called and evolutionary tree, is a tree showing the evolutionary relationships among various biological species or other entities that are believed to have a common ancestor of the descendants, and the edge lengths in some tree correspond to time estimates.
How to read a phylogenetic tree. Phylogenetics trees contain a lot of information about the inferred evolutionary relationships between a set of viruses. Decoding that information is not always straightforward and requires some understanding of the elements of a phylogeny and what they represent. Here is an example (fictional) phylogeny as it may be presented in a journal article: