Last year Dr Benenson's team developed one of the most complex cell-based molecular circuits created so far, though it is still much simpler than systems built in test tubes.

ECONOMIST: DNA computing

Dr. RICHARD HYNES (co-Chair, Committee on Guidelines for Human Embryonic Stem Cell Research, National Academy of Sciences): Good morning.

NPR: Defining the Ethics of Stem Cell Research

Dr. Brentjens and a co-author hold a patent on the engineered T-cell receptor.

WSJ: Gene Therapy Shows Promise as Cancer Treatment

Dr. Brentjens and a fellow co-author hold a patent on the engineered T-cell receptor.

WSJ: Gene Therapy Shows Promise as Cancer Treatment

Obama's order directs the NIH to develop revised guidelines on federal funding for embryonic stem cell research within 120 days, according to Dr. Harold Varmus, president of Memorial Sloan-Kettering Cancer Center and co-chairman of Obama's science advisory council.

CNN: Obama overturns Bush policy on stem cells

The head of the British-based team, Dr. Miodrag Stojkovic, told The Associated Press that the double breakthrough proved that stem cell techniques could be successful in humans.

CNN: Cloning success hailed, feared