When transplanted into infarcted mouse hearts , 9C - treated fibroblasts were efficiently converted to ciCMs .
When transplanted into infarcted mouse hearts , 9C - treated fibroblasts were efficiently developed into healthy - looking heart muscle cells within the organ .
When transplanted into infarcted mouse hearts , 9C - treated fibroblasts were efficiently converted to ciCMs and developed into healthy - looking heart muscle cells within the organ .