What`S The Meaning Of N/A In Result Data Of Paml Dn/Ds Calculation?
Detail: look into this result,some location(about 400bp),their dN/dS equal 0 . the result of dN/dS is N/A . this result means the input data was wrong or dN can be equal 0 ?
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how many synonymous and how many non-synonymous changes are present in these regions (those that have N/A)?
May be there are no 'synonymous substitutions' i.e. dS=0.
Usually N/A stands for Not Available or Not Allowed. Did you get this in codeml?