Membrane fusion is a critical event in biology. Exocytosis, protein
trafficking, and entry of enveloped viruses involve membrane fusion
[1,2]. Moreover, fusion between cells plays key roles in development
as in sperm–oocyte fusion, trophoblast cell fusion, and the formation
of myotubes, osteoclasts, and giant cells . Finally, fusion between
somatic cells and embryonic stem cells is an intriguing phenomenon
in physiology and an important tool in stem cell research