Nearly 10 percent of Americans have diabetes, a chronic condition where the body does not process sugar. Diabetics either do not make enough insulin — a hormone that acts like a key to let sugars into cells to use for energy — or cells stop responding to insulin. As a result, sugar builds up in the bloodstream leading to high blood sugar. Over time, high blood sugar can give rise to nerve damage and heart disease among other complications.

Now researchers have reprogrammed human cells tha