(Kiara Eldred/Johns Hopkins University)Kiara Eldred sometimes compares her nine-month-long scientific experiments, growing tiny human retinas in a laboratory dish, to raising children. After two weeks of painstaking cultivation, those cells typically generate 20 to 60 tiny balls of cells, called retinal organoids. After nine months of assiduous care, Eldred has a batch of miniature human retinas that respond to light, are about two millimeters in diameter and are shaped like a tennis ball cut in half. They also found that thyroid hormone seems to be the critical signal in determining which light-detecting cells develop. Human retinas are about 15 times as big as the organoids, which top out at about the size of the inner ring of a piece of Cheerios cereal, Eldred said.
Source: Washington Post October 11, 2018 18:00 UTC