Muscular Mouse

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Many red shapes, each lined with a green fluorescent dye

The image depicts a cross-section of mouse skeletal muscle magnified 60 times. Fibers in the tissue are fluorescently stained for protein synthesis. The green stain outlines individual fibers. The bright pink/purple fibers are newly growing muscle fibers showing protein synthesis rates of these fiber types for the first time. Images like this allow researchers to observe the rates of protein synthesis in different types of muscle fibers.
Courtesy Brittany Jacobs, Troy Hornberger Lab, School of Veterinary Medicine, UW-Madison, Cool Science Image 2012 Contest Honorable Mention