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Ka/Ks sliding window analysis identifies cifA regions evolving under negative selection. A comparison between cifA homologs from wMel and wHa rejects the neutral expectation of Ka/Ks = 1 using a 25-amino-acid sliding window across most of cifA. Strong purifying selection is observed in several cifA regions including the sequence preceding the catalase-rel domain. Shaded regions denote previously described protein domain predictions (33).
