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Rat or mouse liver is the most frequently used tissue for mitochondrial preparations because it is readily available, easy to homogenize, and replete with mitochondria. A motor-driven Teflon and glass Potter-Elvehjem homogenizer is the best choice for homogenizing liver, but if one is not available, this tissue is soft enough that a Dounce homogenizer with a loose (A) pestle can also be used. The yield and purity of the mitochondrial preparation will be influenced by the method and speed of preparation and the age and physiological condition of the animal.