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The placenta is an apposition of foetal and parental tissue for the purposes of physiological exchange.  There is little mixing of maternal and foetal blood, and for most perposes the two can be considered as separate.
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The placenta is an apposition of foetal and parental tissue for the purposes of physiological exchange.  There is little mixing of maternal and foetal blood, and for most purposes the two can be considered as separate.
    
== Exchange ==
 
== Exchange ==
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