Tweaking a gene makes muscles twice as strong

An international team of scientists has created super-strong, high-endurance mice and worms by suppressing a natural muscle-growth inhibitor, suggesting treatments for age-related or genetics-related muscle degeneration are within reach.

This image shows dramatically enhanced muscle tissue in a high performing mouse, which has greater numbers of mitochondria (brown), the energy factories of cells.

http://www.biologynews.net/archives/2011/11/21/tweaking_a_gene_makes_muscles_twice_as_strong.html