Simplify the following text for a Grade 16 native English-speaking person.
Original: Since then , several other high-resolution structures have been determined by electron crystallography , including the light-harvesting complex , the nicotinic acetylcholine receptor , and the bacterial flagellum .
Simplified: Since then , several other high-resolution structures have been done by electron crystallography , including the light-harvesting complex , and the bacterial flagellum .