Building on a controversial breakthrough made in 2017, scientists announced on Saturday that they have created the second successful human-animal hybrids: sheep embryos that are are 0.01-percent human by cell count.

The embryos, which were not allowed to develop past 28 days of age, move researchers a small step closer to perhaps growing human organs for medical transplant.

Every hour, six people in the United States are added to the national waiting list for organ transplants—and each day, 22 people on the list die waiting. In the U.S. alone, more than a hundred thousand people need heart transplants each year, but only about 2,000 receive one.

In response, researchers are working to artificially expand the organ supply. Some are