In 1992, Bellhouse was at work on a "powdered injector to deliver genetic material into plant cells" when he wondered if he could use the same method on people. A few hours after injecting himself with finely ground salt, the skin began to bleed. As he explained, "Salt bursts the red blood cells. This proved that it had worked. And it was utterly painless. It felt like a puff of air". PowderJect Pharmaceuticals became a public company in 1997 with a £50 million market valuation. It was later sold to
Chiron Corporation for £542 million, and has been called "one of the most successful companies ever to be spun out of Oxford [University]". ==Philanthropy==