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Fertility Glossary

Trophectoderm

The outer cell layer of a blastocyst.

Trophectoderm cells go on to form the placenta, and a few of these cells are removed for biopsy in preimplantation genetic testing.

Related terms

Blastocyst

An embryo that has developed for about five to six days after fertilization.

PGT-A

Preimplantation genetic testing for aneuploidy.

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