Science: Possibly unprecedented in its history, the National Institutes of Health yesterday ordered a shutdown of human embryonic stem cell experiments by researchers in labs on the NIH campus. According to Jocelyn Kaiser of Science, the message came from NIH intramural research chief Michael Gottesman. The action was a response to a court-ordered injunction a week ago, which stated that using NIH funding to study human embryonic stem cells violates a law prohibiting the use of federal funds to destroy embryos.