What is endometrial receptivity, exactly?

In many species, embryo implantation is the most crucial phase in the reproductive process.

There are three steps of the implantation process- Apposition Adhesion Invasion 

After fertilisation, the embryo's imlementation is a complicated process that is influenced by a number of elements.

The moment of a woman's menstrual cycle when the endometrial is ready for implantation is called endometrial receptivity

This step happens during a time known as the 'Window of Implantation'.

In most normal women, the implantation window lasts 3–6 days during the secretory phase

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