Fig. 1From: SSS-test: a novel test for detecting positive selection on RNA secondary structureStructural divergence d of synthetic data sets for families evolved under simulated negative selection pressure (neg) compared to unconstrained (ran) evolution. Each data set is composed of 100 families, evolved from one ancestral sequence to five extant sequences, differing by 5 (left) or 10 (right) accepted substitutions from the ancestorBack to article page