# Applying GNC, a non-stationary codon model

See Kaehler et al for the formal description of this model. Note that perform hypothesis testing using this model elsewhere.

We apply this to a sample alignment.

The model is specified using it’s abbreviation.

## We can obtain the tree with branch lengths as ENS

If this tree is written to newick (using the `write()` method), the lengths will now be ENS.

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Applying a time-reversible nucleotide model

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Applying a time-reversible codon model