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Introduction

Stage 4 is reserved for the attaching blastocyst that is adhering to the endometrial lining of the uterus. The attaching process is called adplantation and heralds the onset of implantation. Stage 4 embryos have an estimated postfertilization age of approximately 6 days.

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Section 28

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Also on EHD: Arteries of the Hand

Attaching Blastocyst

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Embryo attached to an endometrial cell culture

Embryo attached to an endometrial cell culture

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