Research on human embryos is usually limited to the first 14 days of development, but as scientific capabilities improve, some argue that it is time to go further. Emilie is an assistant editor at the ...

The resulting embryos would be kept for up to 14 days to harvest stem cells. In the present state of science, hybrid embryos are produced as research tools, and only kept alive for 14 days or fewer.

While stem cell-based embryo models greatly extend the ability to study this period of development, researchers do not grow these models beyond the current 14-day limit established for donated embryos ...

Microscopy image of a human embryo 7 days after fertilisation. Nuclei are shown in blue, and the shape of each cell is outlined in green. Disclaimer: AAAS and EurekAlert! are not responsible for ...

However, many people hold the opinion that an embryo of any age has the same status as any human being as life begins at conception. at conception? at 14 days old? when there is brain activity and ...