Scientists may have finally cleared the final, toughest hurdle of organ transplant: immune system rejection:

Professor Jonathan Sprent and Dr Kylie Webster from Sydney's Garvan Institute of Medical Research focused on a different type of T cells – known as regulatory T cells (Treg) – in this study. Tregs are capable of quieting the immune system, stopping the killer T cells from seeking out and attacking foreign objects. Usually, these cells live in basic equilibrium, allowing the killer T cells to destroy what needs to be destroyed, but stopping them once the infection is over. The idea was to boost the number of Tregs in the system, quieting the killer T cells for a period of time sufficient for the body to accept the new tissue. After that point, the immune system would return to normal activity.

Sorta sounds like burning a new BIOS for your immune system, eh? Here's to hoping it works as well in humans as it does in mice!