An international team of researchers has developed a drug that could helps in the treatment of post- traumatic stress disorder. PTSD is a mental condition that can develop when someone experiences a disturbing event or series of events . People who suffer from it experience increased anxiety, depresstion and may have problems with their memory . scientists say the drug could be given to someone immediately after a trauma to prevent the development of ptsd. Raul Andero Gali is a researcher at emory university in atlanta , georgie , who studies PTSD. He says it is the only mental disorder with a know trigger , such as a car accident or armed conflict. this means researchers have a better chance of finding a treatment. dr.gali an researchers at several other institutions have worked to find a gene linked to ptsd. they found a gene called oprl1 which releases a protein receptor in the brain of some people under stress. Dr.gali says this receptor can cause people to experience symptoms of ptsd. the researchers experimented on mice to develop a drug that blocks the receptor and reduces anxiety and fear.