#sperm_cell__spermcell__sperm__spermatozoon__spermatozoan  the male reproductive cell; the male gamete
  supertype:  gamete  a mature sexual reproductive cell having a single set of unpaired chromosomes
  part of:  semen  male_reproductive_system
  part:  flagellum  long lash-like appendage used for locomotion (e.g., in sperm cells and some protozoa)
  part:  acrosome  a process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the egg

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