#follicle  any small spherical group of cells containing a cavity
  supertype:  #vesicle__cyst  a small anatomically normal sac or bladderlike structure (especially one containing fluid)
  subtype:  #hair_follicle  a small tubular cavity containing the root of a hair; small muscles and sebaceous glands are associated with hair follicles
  subtype:  #Graafian_follicle  a vascular body in a mammalian ovary enclosing a developing egg

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