To link to the content of EndoNet use the EndoNet ID that is given on the detail
pages in the format ENX0000, where X is a place holder for the type of
the component (e. g. R for receptor or C for anatomical structure).
As URL
for the linking append this ID to the detail page for this type of component.
For an hormone that would be:
The cytotrophoblast is the inner layer of the trophoblast and the part of the trophoblast that retains its cellular structure and does not invade the maternal tissues. It forms the outer surface of the chorion. The trophoblast splits into the cytotrophoblast and the syncytiotrophoblast.