Figure 4 From: Evolution favors protein mutational robustness in sufficiently large populations The polymorphic population neutrally evolved a higher average mutational robustness than the monomorphic populations. The fraction functional was determined by assaying 435 mutants (average of 1.5 nucleotide mutations per gene). Error bars show binomial standard error. For the monomorphic population, numbers are the average over all replicates.Back to article page