
Direct evidence for the restorative hypothesis. (A) Nonsynonymous C-to-U editing is expected to take place following recent T-to-C DNA mutation. (B) Inference of ancestral state of 15 seed plants and five “other ferns.” “Other ferns” refer to the fern species used in this study excluding S. moellendorffi. S. moe is the outgroup of seed plants and “other ferns.” P-value under the statistic table was calculated using χ2 test.










