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Lactate dehydrogenase (LDH) is a protein (enzyme) that speeds up chemical reactions in the body. It is found in red blood cells and in many organs, including the heart, liver, muscles, lungs, brain, and kidneys. There are five different fractions of LDH (called isoenzymes): LDH-1, LDH-2, LDH-3, LDH-4, and LDH-5. A blood...