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PR2 plot analysis of mitochondrial genomes in three Medicago species. The PR2 plot is divided into four quadrants by the central intersection point (G=C and A=T). Quadrant I (top-right) indicates an excess of A and G at the third codon position, while Quadrant III (bottom-left) indicates an excess of T and C. Quadrant II (top-left) indicates an excess of G and T, while Quadrant IV (bottom-right) indicates an excess of C and A.
