Approximately unbiased test (AU) and choice of phylogenetic treeThe statistical significance of the competing phylogenetic hypotheses was assessed under a likelihood model with the approximatelyunbiased (AU) test (Shimodaira and Hasegawa, 2001). To perform theAU test, a set of alternative tree hypotheses must be available.Different phylogenetic hypotheses were obtained for the parsimonyand Bayesian analyses (see below). For each phylogenetic tree, thesite-wise log-likelihood values were obtained with ProtML 2.3b3(Adachi and Hasegawa, 1996), and the AU test was implemented inCONSEL 0.1f (Shimodaira, 2002)
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