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—Box-plots of the control region (CR) length for Psittaciformes, Passeriformes, and Falconiformes. The thick line indicates median, the boxes show quartile range, and the whiskers denote the range without outliers. Results for various types of CRs and gene orders were shown. Single, CR present in one copy; CR1 and CR2, two copies in one mitogenome; FD, the most fully duplicated gene order preserved in Psittaciformes; I–IV, gene orders found in Passeriformes shown in figure 4.
