Human embryos are never far from the policy spotlight. While regulations governing their use have been in place for decades, fresh controversies continually arise in relation to novel science, such as gene editing, and reproductive technologies, such as mitochondrial replacement. Recently, however, attention has been drawn back to the basic principles governing the use of embryos: specifically, the so-called fourteen-day rule. This rule, central to policy in many countries, stipulates that human embryos should not be allowed to grow in vitro past fourteen days of development.
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