A federal judge in Washington, D.C., on Monday issued a ruling temporarily blocking the implementation of new guidelines under the Obama administration that authorize the National Institutes of Health to fund more human stem cell research.

The ruling for the plaintiffs follows a victory in a federal appeals court in Washington in June that revived the challenge of the final guidelines the NIH published in July 2009. The U.S. Department of Justice said it was reviewing the ruling Monday and declined further comment.