The majority of pregnancies that fail do so at a very early developmental stage, before the pregnancy is even detectable by tests. This critical stage, occurring about a week after fertilization, is when an embryo implants itself into the uterus and begins to grow in a complex manner. Now, using mouse embryos, Caltech researchers have new insights into the embryo’s architecture and the structures that enable proper development at this stage.
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Source: Phys.org