- Data are given as mean ± SEM, with the numbers in parentheses indicating the number of fibers tested. Data were fit by Eq. 1. The triple thin lines separate three distinct experimental groups: (1) symptomatic, (2) early-symptomatic, and (3) MLC/SOD1G93A. Significant differences within each group (i.e., between a group of SOD1G93A -expressing fibers and the corresponding age-matched background control fibers) are indicated (* denotes P < 0.05; unpaired t test
