I found this paragraph in my study materials about implantation Original Simples

Question

I found this paragraph in my study materials about implantation

Original

Simplest trophoblast excretes trypsin related substances and embedding consists of 3 stages:

The blastocyst (composed of cytotrophoblast and embryoblast) stick to the uterine wall
Enzymes digest nische (little hole in the endometrium) to the functional layer and the blastocyst deepens in it. The nische is a closed and destroyed functional layer, in it tissue and blood is used for trophic (called a nischtrophic way of feeding)
Implantation ends in 13

Explanation / Answer

I have no idea what is meant by 'the simplest trophoblast'. I did, however, find this review, pointing to a role of proteases in the implantation process:

Salamonsen L.A. Salamonsen and Nie, G. (2002) Proteases at the Endometrial

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