... Criteria of branch quality . As it was repeatedly told , phylogenetic trees consist from branches. ... I. e., those positions, which can separate sequences of the branch from other sequences in the alignment. ... Measure of branch separation . ... Here and further: A - branch of the tree, i , j - sequences of alignment . ... That's why number of conserved positions in some branch should be considered in complex with the distribution of conserved positions in the whole alignment. ...