Waters Corporation and Rosetta Biosoftware Collaborate to Advance the Analysis of Complex Biological Mixtures.

Focus is on Comprehensive Mass Spectrometry (MS) Data Interpretation

MILFORD, Mass. & SEATTLE -- Waters Corporation (NYSE:WAT) and Rosetta Biosoftware today announced a collaboration to develop interfaces that promote compatibility between their software platforms and Waters mass spectrometry-based systems. Specifically, the companies will work together to ensure that Rosetta Biosoftware's solution for protein expression data management and analysis, the Rosetta Elucidator[R] system, will process and analyze mass spectrometry data generated from the Waters[R] Q-Tof Premier[TM] and Synapt[TM] High Definition Mass Spectrometry[TM] (HDMS) Systems.

The collaboration will focus on developing software interfaces between the Elucidator system and Waters instrument systems that will give scientists the capability to perform comprehensive qualitative and quantitative profiling of complex biological mixtures.

"We are pleased to enable compatibility between the Elucidator system, and our innovative UPLC/MS(E) data acquisition methods and instruments," said Tim Riley, Vice President and Managing Director - Pharmaceutical Business Operations, Waters Division. "This collaboration will enable more of our customers to take advantage of our advanced mass spec technologies to comprehensively analyze the results of their most demanding experiments."

"Collaboration with Waters will allow us to rapidly adapt to advances in Waters instrument technology, ensuring that our customers have continued access to a robust end-to-end solution," said Yelena Shevelenko, Vice President and General Manager of Rosetta Biosoftware. "The streamlined integration will improve research productivity and provide solutions for a broader scientific audience."

The Waters Corporation and Rosetta Biosoftware will be exhibiting their latest technologies at the 55th American Society for Mass Spectrometry (ASMS) Conference on Mass Spectrometry, June 3 - 7, 2007, in Indianapolis, Indiana.

About Waters Corporation (www.waters.com)

Waters Corporation creates business advantage for laboratory-dependent organizations by delivering practical and sustainable innovation to enable significant advancements in such areas as healthcare delivery, environmental management, food safety, and water quality worldwide.

Pioneering a connected portfolio of separations science, laboratory information management, mass spectrometry and thermal analysis, Waters technology breakthroughs and laboratory solutions provide an enduring platform for customer success.

With revenue of $1.28 billion in 2006 and 4,700 employees, Waters is driving scientific discovery and operational excellence for customers worldwide.

Additional information on Waters Q-Tof Premier[TM] and Synapt HDMS[TM] System is available at www.waters.com.

About the Rosetta Elucidator System

The Elucidator system's advanced data management capabilities allow users to effectively organize, search for, and retrieve raw and processed protein expression data. The application serves as a core integrator for proteomics research by working directly with select instrument APIs, sample annotation systems, and common protein ID search engines. In addition, it provides a suite of advanced statistical analysis and visualization tools for data mining and discovery of potential protein biomarkers and proteins that are differentially expressed among different phenotypes or drug treatments. The Elucidator system combines these data management and analysis capabilities with the flexibility of a highly customizable environment: users can incorporate organization-specific workflows into customized visual scripts that leverage Elucidator system statistical tools and customer-proprietary algorithms, as well as those available in the public domain. The Rosetta Elucidator product line is designed to meet the needs of both large and small organizations.

Additional information about the Rosetta Elucidator system can be found on the Rosetta Biosoftware Web site at www.rosettabio.com.

About Rosetta Biosoftware

Rosetta Biosoftware, Seattle, Wash., is a leading provider of informatics solutions for life science research. Its comprehensive software solutions, including the Rosetta Resolver and Rosetta Elucidator systems, empower life scientists with advanced, scalable, and easy-to-use analysis platforms that accelerate discovery research. Rosetta Biosoftware is a business unit of Rosetta Inpharmatics LLC, a wholly owned subsidiary of Merck & Co., Inc. (NYSE: MRK). More information about Rosetta Biosoftware is available at www.rosettabio.com.

Forward-Looking Statements

This press release contains "forward-looking statements" as that term is defined in the Private Securities Litigation Reform Act of 1995. These statements involve risks and uncertainties, which may cause results to differ materially from those set forth in the statements. The forward-looking statements may include statements regarding product development, product potential, or financial performance. No forward-looking statement can be guaranteed, and actual results may differ materially from those projected. Neither Rosetta Inpharmatics nor Merck & Co., Inc. undertakes any obligation to publicly update any forward-looking statement, whether as a result of new information, future events, or otherwise. Forward-looking statements in this press release should be evaluated together with the many uncertainties that affect the business of Merck & Co., Inc. including, among others, the extent to which Rosetta Inpharmatics' technology platform can be used in drug discovery programs, uncertainty of market acceptance of Rosetta Inpharmatics' technologies, ability to compete against existing technologies, and those mentioned in the cautionary statements in Item 1 of Merck's Form 10-K for the year ended Dec. 31, 2006, and in its periodic reports on Form 10-Q and Form 8-K (if any) which are incorporated by reference.

Waters, Synapt, Q-Tof Premier, High Definition Mass Spectrometry, HDMS and Q-Tof are trademarks of Waters Corporation. Rosetta Resolver and Elucidator are U.S. registered trademarks of Rosetta Inpharmatics LLC.