Titlebook: Comparative Placentation; Structures, Function Peter Wooding,Graham Burton Book 2008 Springer-Verlag Berlin Heidelberg 2008 Comparative.Fun

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Fish, Amphibian, Bird and Reptile Placentation,ssman 1987). The most widely used system is an increased secretion of nutrients into the ovarian or uterine cavity and absorption via the fetal gut or skin surface, but a number of genera have produced specialized structures, both embryonic and extraembryonic, some of which closely parallel amniote

物质

Climate

Eutheria: Epitheliochorial Placentation Pig and Horse, development essentially involves a vast increase in area with no loss of any layers between the fetal and maternal bloodstreams. The exclusively cellular layers may become exceedingly attenuated, reducing the diffusion distance as pregnancy proceeds, but all persist to term (Amoroso 1952; Steven 19

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Microgram

Eructation

Haemochorial Placentation: Mouse, Rabbit, Man, Apes, Monkeys,nd to such a sequence; with the loss of all the maternal tissue, maternal blood irrigates the chorioallantoic fetal trophectoderm directly (Fig. 1.5)..Previous suggestions that in some species the fetal trophectoderm is also lost have not been substantiated by subsequent EM studies. The trophectoder

Asseverate

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