In vertebrates which protein gives red muscle its color?

The protein that gives red muscle its color is myoglobin. Myoglobin is a protein that is found in the muscle cells and it is responsible for the storage of oxygen. Myoglobin is found in both red and white muscle fibers, but it is more concentrated in red muscle fibers. Red muscle fibers are used for sustained, low-intensity activities such as walking or running, while white muscle fibers are used for short, high-intensity activities such as sprinting.