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(a) Pairwise sequentially Markovian coalescent (PSMC) estimates of the changes in effective population size over time for Asian butternuts (Juglans mandshurica, J. ailantifolia and J. cathayensis). (b) F ST for each polymorphic site of 144 mitochondrial, 117 chloroplast, 39 dual targeted nuclear‐encoded protein‐coding genes and 300 random selected nuclear genes without interaction with organelle. Error bar in panel (b) is mean ± SD.
