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Rigor mortis is the postmortem stiffening of the muscles that occurs after death due to biochemical changes in the muscle tissue. It typically begins a few hours after death, starting in smaller muscle groups before spreading to larger ones, and can last for several days until the body begins to decompose. This phenomenon is used in forensic science to help estimate the time of death. Rigor mortis results from the depletion of ATP, which is necessary for muscle relaxation.

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