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What's done today is called a trophectoderm biopsy. You can think of that as a biopsy
that's done on a blastysis (five-day embryo) - which looks like a little ball - inside
that ball is an inner cell mass that's going to be the baby. The biopsy is done not on
the inner cell mass, but on that outer part that is destined to be the placenta. That
is why it is touted as being safer, because you are not biopsying the baby. The technical
ways of testing those chromosomes have progressed over time so that they're highly accurate
in telling you the genetics of the cells that have been biopsied. So, we have a combination
of something which is theoretically much safer and technically much more accurate, which
should translate into a better test.