SOD1 and amyotrophic lateral sclerosis: The next phase of the analysis of mechanical stiffness was calculating the correlation between survival time of ALS patients with SOD1 mutations and stiffness \documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$ {\kappa}_{m_ki} $$\end{document}κmki where mk indicated mutant positions (k = 1, 32) and i was the position within the protein (i = 1, 153).