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To mitigate the effects of such model violations, the phylogeny-aware alignment algorithm has been re-implemented in program PAGAN. By using sequence graphs, PAGAN can model and accumulate evidence from more complex gap structures than PRANK does, and incorporate this uncertainty in the inferred ancestral sequences. These issues are discussed in detail below and practical advice is provided for the use of PRANK and PAGAN in evolutionary analysis. The two software packages can be downloaded from http//wasabiapp.org/software .Clustal Ome