#semilunar_valve__semilunarvalve  a heart valve with half-moon-shaped cusps; prevents blood from flowing back into the heart
  supertype:  cardiac_valve__cardiacvalve__heart_valve  a valve to control one-way flow of blood
  subtype:  aortic_valve  a semilunar valve between the left ventricle and the aorta; prevents blood from flowing from the aorta back into the heart
  subtype:  pulmonary_valve__pulmonaryvalve  a semilunar valve between the right ventricle and the pulmonary artery; prevents blood from flowing from the artery back into the heart

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