Scientists recently got excited when the lengthened the petri dish lifetime of human embroyosvuntil,at least 14 days from a previous record of 7 days. The shorter time was sufficient of IVF. But too short understand embroyo development.
<a href="http:&#x2F;&#x2F;www.npr.org&#x2F;sections&#x2F;health-shots&#x2F;2016&#x2F;05&#x2F;04&#x2F;476539552&#x2F;advance-in-human-embryo-research-rekindles-ethical-debate" rel="nofollow">http:&#x2F;&#x2F;www.npr.org&#x2F;sections&#x2F;health-shots&#x2F;2016&#x2F;05&#x2F;04&#x2F;47653955...</a><p>Currently there is a moratorium of embryos longer than 14 days. That is when tissues start differentiating and embroyos has become implanted in the womb.