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The biochemical composition of uterine and fetal fluids during pregnancy of the grey short-tailed opossum was compared with new and published data on the tammar wallaby. In the grey short-tailed opossum, there are three main phases of embryonic nourishment. During the first phase, the embryo obtains nutrients from uterine secretion transferred into the yolk sac. The amount of uterine secretion declines...
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