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of early embryonic development could offer valuable insights into the nature of miscarriage and aid fertility research. The study could also open up new avenues of research into the origins of disease and efficacy of treatments using human embryonic stem cells.


"We're going to take a step back to the first day and systematically move forward," said Brivanlou. "We'd like to get the complete molecular signature, and then move on to how these cells communicate with one another to figure out what cell type they are supposed to become. There is a lot more to be studied during this stage and we look forward to shedding more light on this vital step in human development."


The study, published in the journal Nature, was accompanied by commentary recommending new ethics rules and an extended limit for the growth and development of embryos in the lab.


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