Big news in the medical world: scientists in Australia have found a way to stop the body from attacking organ transplants, greatly decreasing the possibility of organ rejection.

The last major hurdle of transplantations is the body itself. When a new tissue is introduced, one’s immune system kicks into overdrive, sending out cells known as killer T cells to attack and destroy the unknown tissue. Because of this, those who receive transplants have to maintain a regime of toxic immune-suppressing drugs.