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Most doctors believe gastrointestinal stromal tumors (GISTs) start in special cells found in the wall of the GI tract, called the interstitial cells of Cajal (ICCs), or in very early cells that can develop into ICCs. ICCs are part of the autonomic nervous system, which sends signals to the GI tract. Some have called these cells the -pacemakers- of the GI tract because the nerve signals they send cause muscles of the digestive organs to contract, which helps to move food and liquid through the GI tract. This issue is an important one because GISTs are rare and are quite different in their...