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(a) 4DTv distribution of duplicate gene pairs in P. mume and M. × domestica, calculated based on alignment of codons with the HKY (Hasegawa, Kishino and Yano) substitution model. (b) The duplication of P. mume by paralogous pairs in the P. mume genome (chromosomes Chr1–Chr8). Each line represents a duplicated gene. The seven colours reflect the seven ancestral eudicot linkage groups (A1, A4, A7, A10, A13, A16 and A19).
