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To determine the changes of gastrointestinal migrating motor complex (MMC) during the early stage of cholesterol gallstone formation. Totally 45 healthy adult guinea pigs were randomly and equally divided into 3 groups, that is, normal control, group B (1% cholesterol diet for 2 weeks) and group C (1% cholesterol diet for 4 weeks). Three pairs of silver electrodes were inserted into the gastric...