Imbalanced positive selection maintains the functional divergence of duplicated DIHYDROKAEMPFEROL 4-REDUCTASE genes.

Homogeneous evolutionary rates could not be rejected in θ I ( θ I = 0.039 ± 0.074, Z -score = 0.074, P = 0.296), suggesting that type-I divergence was not supported, although marginal significance was detected in θ I ML test ( θ I ML = 0.462 ± 0.240, LRT = 3.694, P = 0.055).

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