A combined dataset of 189 non-overlapping Alu subfamilies was analyzed with jModelTest-2.1.10 [32 (link)] to determine the best nucleotide substitution model for this dataset. The Akaike information criterion (AIC) and Bayesian information criterion (BIC) models were a gamma distribution. Both the AIC and BIC model selection were TrN+G (variable base frequencies, equal transversion rates, variable transition rates, and gamma distributed rate variation among sites). The TrN+G model is in agreement with a previous analysis of Alu subfamilies derived from the squirrel monkey genome [18 (link)].
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