Canadian rider Tiffany Foster, on her horse Victor, competes in the qualifying round of the equestrian jumping event at the London 2012 Olympic Games August 4, 2012. Foster was disqualified before the team show jumping final on August 5, 2012 because of hypersensitivity in her horse's front leg, a decision team captain Eric Lamaze called "a complete miscarriage of justice". Picture taken August 4, 2012. REUTERS/Mike Hutchings (BRITAIN - Tags: SPORT EQUESTRIANISM OLYMPICS) 

Canadian rider Tiffany Foster, on her horse Victor, competes in the qualifying round of the equestrian jumping event at the London 2012 Olympic Games August 4, 2012. Foster was disqualified before the team show jumping final on August 5, 2012 because of hypersensitivity in her horse's front leg, a decision team captain Eric Lamaze called "a complete miscarriage of justice". Picture taken August 4, 2012. REUTERS/Mike Hutchings (BRITAIN - Tags: SPORT EQUESTRIANISM OLYMPICS) 

A woman with allergies is stung with a bee by a bee sting therapist in a farm in Silang, Cavite south of Manila June 6, 2012. Farm owner Joel Magsaysay uses bee stings to treat patients with ailments such as hypothyroidism, paralysis and cancer. Magsaysay said the bee's venom contains a potent cocktail of proteins that boost auto-immune system that let the body activate the nerves and heal itself. REUTERS/Erik De Castro (PHILIPPINES - Tags: SOCIETY HEALTH ANIMALS) 

"Clarinex" brand allergy medication pills are shown in the pharmacy of the J.W.C.H. safety-net clinic in the center of skid row in downtown Los Angeles, July 30, 2007. REUTERS/Lucy Nicholson (UNITED STATES) 

Scientists said on October 9 they had discovered a very small group of spinal nerves that might be responsible for chronic pain, and a "time-bomb" drug that shuts them off. Tests in rats showed it was possible to turn off the "bad" pain, such as hypersensitivity that plagues arthritis sufferers, for example, without costing them the "good" pain reflexes that keep the body away from a hot flame. Researchers worked on a small number of cells that snagged substance P, a peptide known to be involved in pain. The image shows one of these "bad" pain cells (yellow) surrounded by normal cells (red).