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Divergence date estimates for duplicate gene pairs. The thin line shows the standard errors around the estimates. The dashed line is positioned at 4Ne years (= generations) given an estimate of Ne for A. thaliana at 4 × 105. The duplication events that gave rise to each duplicate pair occurred after the species split between A. lyrata and A. thaliana, which occurred ≈5.2 mya (29).
