The interdisciplinary nexus of biology and engineering, known as synthetic biology, is growing at a rapid pace, opening new vistas that could scarcely be imagined a short time ago. Research, first proposed in 1994, shows how computer-like circuits can be built using ribonuclied acid or RNA. As computer logic boards do, these bio-circuits receive an input/signal from our body and react (or provide output). Imagine your body is getting attacked by a virus which needs certain protein to be released to solidify the defense. This is now more plausible than ever. Read more below.

Source: Living Computers: RNA Circuits Transform Cells Into Nanodevices