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Last update on 04. Mar 2022 .
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    A tree consists of two types of 'nodes':

    • tips or terminal nodes: species
      connected to exactly one father
    • inner nodes: hypothetical ancestors
      connected to one father (and in the binary case to two children). A group_name may be assigned to an inner node; in this case, the node and all its children become a group. <ARB_NT/INFO_MODE/M>

    There are significant differences between phylogenetic trees and binary trees:

    phylogenetic trees                      binary trees:
    unrooted                                rooted
    inner nodes have n children             all inner nodes have two children

    Since binary trees are much easier to handle, ARB converts phylogenetic trees to binary trees.