Se-Jin Lee, the molecular biologist at Johns Hopkins University who discovered myostatin in mice in 1992, says it's "disappointing" that MYO-029 is dead, but he still believes blocking myostatin holds promise.
"This is the first evidence that myostatin regulates muscle mass in people as it does in other animals, " said Dr Se-Jin Lee, professor of molecular biology and genetics at Johns Hopkins University and one of those involved in the study.