注意选最佳模型参数时设置此值为3，否则得到的除1/2/6之外的nst值时，MrByes不接收
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MrBayes 3 implements three main types of models; you select among those by setting the number of substitution types using lset nst to 1, 2, or 6. The widely used General Time Reversible (GTR) model has six substitution types (lset nst=6 ), one for each pair of nucleotides.
No valid match for argument "4"
Invalid Nst argument
Error when setting parameter "Nst" (2)
There was an error on at least one processor
The error occurred when reading char. 23-23 on line 207
in the file 'infile.nex'
Set the number of substitution schemes (-s)
This flag sets the number of substitution schemes. 3 = JC/F81 K80/HKY SYM/GTR; 5 = JC/F81, K80/HKY, TrNef/TrN, TPM1/TPM1uf, SYM/GTR 7 = JC/F81, K80/HKY, TrNef/TrN, TPM1/TPM1uf, TIM1ef/TIM1, TVMef/TVM, SYM/GTR; 11 = all named models; 203 = All possible GTR submatrices
https://mrbayes.sourceforge.net/Help/lset.html
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