For 10 points, name this protein that transports oxygen to muscle cells.
Richard Marlar found this protein at the pre-historic Cowboy Wash site in fossilized fecal matter. This protein, which has a Hill coefficient of one, contains a single polypeptide chain of 153 amino acid residues. This protein was isolated from sperm whales by John Kendrew, who made it the first protein to have its three-dimensional structure obtained using X-ray diffraction. The red color of meat is due to this protein, which contains only one heme group, unlike a similar tetrameric protein. For 10 points, name this protein that transports oxygen to muscle cells.
Richard Marlar found this protein at the pre-historic Cowboy Wash site in fossilized fecal matter.
myoglobin [do NOT accept "hemoglobin"] 