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Myoglobin (Mb) is a cytoplasmic hemoprotein which plays an important role in oxygen storage and transport in cardiac and skeletal muscle under hypoxia.The red tail toad-headed lizard Phrynocephalus erythrurus (Lacertilia: Agamidae),which inhabits at an elevation of 4500-5300 m on the Qinghai-Tibetan plateau,has known to be the highest living lizard in the world.