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More documentation can be found on the ARB website.
Last update on 08. Apr 2009 .
Main topics:
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Trees

OCCURRENCE

ARB_NT

 

DESCRIPTION

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.