I am trying to detect positive natural selection in a group of sequences
using Ka/Ks comparisons. The problem is that my number of Ks is zero in
one of my branches. With this zero in the denominator, I get undefined
answers and strange results using the PAML program.
Has anyone seen a case like this? It seems like someone must have
encountered this before, and I'd like to see how it was handled. Any
other ideas might be helpful, too.
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