Despite the political nature of stem cell research, this area of science continues to flourish in the United States. In 2011, the NIH funded approximately US$1.2 billion in stem cell research — a steady increase from past years — with US$123 million devoted to human embryonic stem cells. According to the ISI Web of Science, more than 4,000 U.S.-authored stem cell publications were produced in 2011, accounting for approximately 38 percent of the world total. Approximately one-quarter of these publications were collaborations with authors from other countries.
