#semen__seed__seminal_fluid__seminalfluid__ejaculate__cum  the thick white fluid containing spermatozoa that is ejaculated by the male genital tract
  supertype:  liquid_body_substance__bodily_fluid__body_fluid__humor__humour  the liquid parts of the body
  subtype:  milt  seminal fluid produced by male fish
  part:  sperm_cell__spermcell__sperm__spermatozoon__spermatozoan  the male reproductive cell; the male gamete
     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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