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* Sperm nuclear membrane disappears.
 
* Sperm nuclear membrane disappears.
 
* Sperm '''nucleus decondenses'''.
 
* Sperm '''nucleus decondenses'''.
[[Image:Fertilization histology.jpg|right|thumb|250px|<small><center> Electron Scanning Micrograph of Spermatozoa in the Uterine Horn.  Copyright RVC 2008 (Courtesy of John Bredl (RVC))</center></small>]]
      
== Cortical Reaction - Block to Polyspermy ==
 
== Cortical Reaction - Block to Polyspermy ==
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