Evolvability-enhancing mutations in the fitness landscapes of an RNA and a protein.

\usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\bar{w}\left({n}_{{wt}}\right)=$$\end{document} w ̄ n w t = 0.48, a difference that is highly significant ( P = 3.8 × 10 −148 , two-sided Mann–Whitney U = 43,750, n = 681).

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