1. 
   X zone
   A transient adrenocortical zone present in some rodents at birth, most notably in mice, situated between the zona reticularis and the adrenal medulla; it degenerates in males with the secretion at puberty and in females during their first pregnancy; it slowly enlarges in unmated females after pubert...
   Found op http://www.mondofacto.com/facts/dictionary?X+zone
   
   
2. 
   X zone
   fetal zone of adrenal cortex.
   Found op http://www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspzQzpgzEzzSzppdocszS
   
   
3. 
   X-Zone
   X-Zone is a game released in 1992 by Kemco for the Super NES. It was one of the few games to support the Super Scope light gun. The players assume the role of a soldier in flying power-armor assigned to destroy an army of malfunctioning defense robots commanded by a sentient bio-computer in its sud...
   Found op http://en.wikipedia.org/wiki/X-Zone
   
   

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