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Evolution of the maternal–fetal interface. Maximum-parsimony phylogenetic reconstruction of the maternal–fetal interface of 141 mammals through parsimony analysis showing the root placental mammal having a haemochorial placenta (white) with epitheliochorial (black) and endotheliochorial (green) as divergent states [3,8,21–24]. Tree topology taken from [25]. (Online version in colour.)
