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Fertility Glossary

Cleavage-stage embryo

An embryo two or three days after fertilisation.

At this stage an embryo has roughly four to eight cells. Some clinics transfer on day two or three, particularly where few embryos are available.

Related terms

Embryo

The developing group of cells formed after fertilisation.

Blastocyst

An embryo at day five or six with a fluid-filled cavity.

Embryo transfer

Placing an embryo into the uterus through a fine catheter.

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