Behe contends that evolution cannot fully explain the biological complexities of life such as the immune system and blood clotting suggesting the work of an intelligent force.

MSN: Intelligent design vs. stack of science books

This approach has the advantage that the tissue has a functioning system of blood vessels to deliver nutrients, so it should be possible to grow tissue cultures more than a millimetre thick the current limit.

ECONOMIST: Monitor

Topping up the supply of healing fluid might be done by mimicking another biological system the network of blood capillaries that supplies living tissues with the stuff they need to thrive.

ECONOMIST: Monitor