#cardiac_valve__cardiacvalve__heart_valve  a valve to control one-way flow of blood
  supertype:  valve.anatomical_structure  a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it
  subtype:  atrioventricular_valve  semilunar_valve
  part of:  heart.internal_organ
  part:  cusp.flap__leaflet  a thin triangular flap of a heart valve

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