| Issue 69  
    
        
        
How does the body avoid multiple sperm fertilizing an egg?
You shall not pass: discover how the protein coating around an egg cell ‘zips up’ after fertilization to stop more sperm from entering.
 
    
    
    
    
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                    You shall not pass: discover how the protein coating around an egg cell ‘zips up’ after fertilization to stop more sperm from entering.                    
        
         | Issue 69  
    
        
        
            
                How does the body avoid multiple sperm fertilizing an egg?