Analysis identifies target for immune response that could improve AIDS vaccines. HIV is finally revealing its weak spots to researchers, bringing an effective vaccine against AIDS closer to reality. A paper published in Nature today1 sheds light on how a vaccine can turn the immune system against the invading virus and so offer protection from infection. The results are also being presented at the AIDS Vaccine 2012 conference in Boston, Massachusetts, this week. The findings help to explain the results from a clinical trial of an AIDS vaccine that have puzzled researchers since they were published three years ago2. The...