#mother_cell  cell from which another cell of an organism (usually of a different sort) develops: "a sperm cell develops from a sperm mother cell"
  supertype:  #cell  the basic structural and functional unit of all organisms; cells may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals
  subtype:  #spore_mother_cell  cell from which a spore develops

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