Merck & Co., Inc. Announces Completion of Acquisition Of Sirna Therapeutics, Inc.

WHITEHOUSE STATION, N.J.--(BUSINESS WIRE)--Merck & Co., Inc. (NYSE: MRK) today announced that it has successfully completed the acquisition of Sirna Therapeutics, Inc. (NASDAQ: RNAI) in a cash transaction which closed in the fourth quarter of 2006.