Talk:Zona pellucida
From Embryology
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2582072/?tool=pmcentrez
http://www.springer.com/open+access/open+choice?SGWID=0-40359-12-683308-0
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2528931/?tool=pmcentrez