#reproductive_cell__germ_cell__sex_cell__sexcell  a spermatozoon or an ovum
  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:  #gamete  a mature sexual reproductive cell having a single set of unpaired chromosomes
  part of:  #reproductive_system__genital_system__genitalsystem  organs and tissues involved in the production and maturation of gametes and in their union and subsequent development as offspring
     part of:  #urogenital_system__urogenital_apparatus__urinary_system__urinarysystem__urinary_apparatus__urinaryapparatu__genitourinary_system__genitourinarysystem__genitourinary_apparatus__genitourinaryapparatu__systema_urogenitale__systemaurogenitale__apparatus_urogenitalis  the system that includes all organs involved in reproduction and in the formation and voidance of urine

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