#physiological_sphincter__physiologicalsphincter  a sphincter that is not recognizable at autopsy because its resting arrangement cannot be distinguished from adjacent tissue
  supertype:  #anatomical_sphincter__sphincter__sphinctermuscle  a ring of muscle that contracts to close an opening
  subtype:  #cardiac_sphincter__cardiacsphincter  the valve between the distal end of the esophagus and the stomach; the physiological sphincter at the esophagogastric junction

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