I want to convert the gene tree into the species tree by using some
software. I don't want to infer the gene loss or gain by using the GeneTree,
NOTUNG etc. I just want to use the software to convert the gene tree into
species tree. If the gene number is tha same as the predefined species
number, that means we can directly replace the species name with gene name,
but in most situations, the gene number would be less than predefined
species number. so, we need find some algorithms to find the species tree.