Super-broccoli, bred from ordinary broccoli and a wild Sicilian relative, looks and tastes the same as ordinary broccol. But it contains 10 times as much sulphoraphane, a substance that helps to neutralise cancer-causing substances in the gut?Sulphoraphane is found in all brassicas, including sprouts and cauliflower - but broccoli has the highest concentrations. This souped-up (no pun intended) version of broccoli was developed by a team at the Institute of Food Research in Norwich headed byGary Williamson. At an Institute of Food Research seminar in London earlier this month, Williamson said that he expects people who eat it to produce even higher concentrations of glutathione transferase - powerful enzymes that destroy cancer-causing substances in food, such as those found in heavily barbecued meat. Trials of the super-broccoli are due to begin soon in human volunteers and will measure any boosts in concentrations of glutathione transferases in gut and blood samples compared with ordinary broccoli. Williamson also hopes to show the super-broccoli is better at protecting the DNA in cells from the ravages of time. The super-broccoli, originally bred at the nearby John Innes Centre, is being developed with two commercial partners.