Figure 1: Mechanical response of fibers from aged animals. Raw data (a, c, e) and regression coefficients (b, d, f) for (a-b) Cauchy stress-fiber strain (quadratic regression); (c-d) LaGrangian stress-fiber strain (linear regression); (e-f) radial strain-fiber strain (exponential regression) for fibers from 10-month-old wild-type (blue), desmin-null (red), K19-null (orange), and double-null (green) animals ( fibers/genotype). Different symbols within a color group represent data from individual experiments. Displayed regression lines in (a), (c), and (e) represent averaged coefficients for individual experiments reported in (b), (d), and (f). * Indicates significant difference from wild-type; § indicates significant difference from K19-null; ¥ indicates significant difference from corresponding genotype in younger animals. values are reported in the text.