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Nutrition comes from the yolk sac with minimal histotrophy. The outer lining part of the uterus is increased by villi that presumably boost in length with advancing gestation. These villi aren't likely to be secretory but play a key role in the air offer to your embryo. We argue that the ability associated with the uterus to supply air is a limiting factor for litter dimensions, which can be improbable to meet or exceed the tiny quantity reported in this an
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