**FILE**In a file photo an employee walks past a stained-glass window, bearing Merck & Co.'s name, as he walks to the elevator at the company's headquarters in a Whitehouse Station, N.J. , Sept. 30, 2004. Pharmaceutical company Merck & Co. said Monday, Oct. 30, 2006, it agreed to pay $1.1 billion to buy Sirna Therapeutics Inc., a tiny biotechnology firm developing drugs based on new technology at the heart of last month's Nobel Prize for medicine award. (AP Photo/Daniel Hulshizer, File)