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* At this stage it is not possible to discriminate between male and female gonads.
 
* At this stage it is not possible to discriminate between male and female gonads.
 
* Y chromosomal determination of gonadal sex is only visible when primordial germ cell colonisation is complete.
 
* Y chromosomal determination of gonadal sex is only visible when primordial germ cell colonisation is complete.
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[[Image:Sexual Differentiation primordial germ cell migration a.jpg|right|thumb|250px|<small><center> Schematic showing Early Sexual Differentiation. Copyright RVC 2008 (Courtesy of Proff.R.Abayesekara (RVC))</center></small>]]
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