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Proportions of all sites (gray bars) and positively selected sites (colored bars) according to the M1a/M2a and M7/M8 LRT in different secondary structures determined experimentally (A) and predicted computationally (B). A threshold probability of Ps ≥ 0.5 was used in (A) and two thresholds (Ps ≥ 0.9 or ≥ 0.99) were used in (B).
