The studies are to be published in the early online issue of the Proceedings of the National Academy of Sciences (PNAS) and are the work of two teams of scientists at Duke University Medical Center in Durham, North Carolina.

• 这项研究将刊登在PNAS的网站上，并且是来自北卡罗来纳州达勒姆杜克大学医学中心的两名科学家的工作。