Right. It is an amazing effect and biologically very instructive, however horrific it might be. Someone pointed out that it probably would not have been possible for the disease to spread if the Devils had not been so inbred that the range of variation in their tissue typing genetics is so reduced that they do not reject each other's cells. This is almost certainly because farmers had so nearly wiped them out that they passed through a population bottleneck, which caused the loss of much of their genetic diversity. Apart from anything else, it all highlights the risks of reducing a population too far.

Go well,

Jon