We then tested whether the YPS differed among species with a villous and smooth placenta and found that the two placenta types did not significantly differ in YPS and that YPS did not significantly increase with a higher MI (although a positive trend was apparent for species with “smooth placentas”; Fig. 4C and fig.
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Repeated independent origins of the placenta reveal convergent and divergent organ evolution within a single fish family (Poeciliidae).
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