To this end, with exclusion of gnetophytes from data sets, tree-building method and breadth of taxon sampling no longer influence the placements of ginkgo, but the sequence type is a determinant.
Then, the excluded taxa are deposited into this core set tree by solving the equation of motion with the same potential function.
Some of these patterns disrupted even the core set tree (Fig. 2c).
The obtained core-set tree contains no correlated mutations and satisfies the compatibility.
The number of brackets denotes the frequency of nucleotide transitions in only the core set tree.
Existing methods (MP, SP, ML and NJ) produce the same single tree as the P-core set tree.
The procedure of T-core set tree-building is so useful that the S-core set tree may be almost constructed by this procedure and finally confirmed by using the PAUP*.
As a result, the sequence number 22– 27 were further deposited on the P-core set tree, and a S-core set tree of the total 27 sequences was obtained (Fig. 1b).
The second procedure is to insert the excluded sequences into the P-core set tree, using a min-max criterion.
Here, we assume that this core set tree is robust and preserved by insertion of the excluded sequences.
We furthermore decompose the global core set tree into more than three subgroups, and repeat the above-mentioned procedure.
