One of Greg Bear's earlier books, Blood Music is about a biologist who creates intelligent cells, which exchange DNA and RNA so they can communicate and think. When he is forced to shut down the experiment, he injects himself with the latest results of his experiments: intelligent lymphocytes (white blood cells). The intelligent cells (called noocytes) evolve in his bloodstream, and start to alter him, improving his body, until they realise what he is, communicate with him (via the Blood Music in his head)and expand to the outside world. The book’s good, and the longer version (it was originally released as a short story), also introduces the cool idea of information mechanics. It won the Hugo and Nebula awards, and is one of Greg Bear’s best books.