Sir, You recently published a letter (2) in which I argued that progress in AIDS research is being delayed because the present system of funding is inhibiting collaboration between researchers. I reported that after I had responded positively to requests for samples of my cDNA recombinants from various US laboratories engaged in AIDS-related research, my research grant applications were rejected by three major funding organizations (US and Canadian). Specifically, a Canadian organization gave as a major reason for refusing funding the fact that I had shared my recombinants.