myoglobin

protein
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myoglobin, a protein found in the muscle cells of animals. It functions as an oxygen-storage unit, providing oxygen to the working muscles. It is found predominantly in striated muscle tissue, namely skeletal muscle and cardiac muscle. mammalssealswhales There is a close chemical similarity between myoglobin and hemoglobin, the oxygen-binding protein of red blood cells. Both proteins contain a molecular constituent called heme, which enables them to combine reversibly with oxygen. The heme group, which contains iron, imparts a red-brown color to the proteins. The bond between oxygen and hemoglobin is more complex than that between oxygen and myoglobin and accounts ...(100 of 278 words)