Fig. 2: Timeline of the establishment of various cell lines and trophoblast fusion models.
From: A comprehensive review of human trophoblast fusion models: recent developments and challenges

The timeline is divided into intervals of 10 years, with events in each decade marked with the same background box. The time of the first establishment of various cell lines is marked above the timeline, while the time of the first use of these cell lines in trophoblast fusion models is marked below the timeline.