#NEXUS [ Using generalized parsimony with PAUP* ====================================== The vast majority of both molecular and morphological MP analyses made use of unordered or "Fitch" parsimony. Here, all possible steps from each character state to each other character states have the same cost of 1. However, parsimony can be "generalized" by defining a unique cost for each state-to-state transition. With nucleotide data, it is straightforward to give transitions a lower weight than transversions, as can be done with an assumptions block: ] begin assumptions; usertype tstv stepmatrix = 4 A C G T [A] 0 2 1 2 [C] 2 0 2 1 [G] 1 2 0 2 [T] 2 1 2 0 ; typeset * tstv = tstv: all; end;