SIGNATURE BIOSCIENCE SIGNS WITH GENETICXCHANGE FOR ITS discoveryHub DATA INTEGRATION SOLUTION

Powerful Query and Integration Capabilities Helping to Speed Drug Discovery By Turning Data into Knowledge

MENLO PARK, CA - June 4, 2002 - geneticXchange, the premiere provider of data access and integration software solutions for the life sciences industry, today announced an expanded relationship with Signature BioScience, Inc., a detection-based drug discovery company, to increase its use of the geneticXchange discoveryHub product. discoveryHub facilitates Signature's seamless data integration on proteins and pathways gathered from its unique microwave-based spectroscopy, in order to develop a deeper understanding of the relationships between targets.

"The bottleneck in drug discovery has clearly shifted from data collection to data integration and analysis, as more and more scientific data is becoming available via both public and private research efforts," said Jeff Edwards, president of geneticXchange. "Signature BioScience provides a powerful drug discovery platform that is helping to uncover key information about the way cells and proteins interact with small molecules in order to identify and prioritize pre-clinical leads very early in the discovery process. Using our discoveryHub data access and integration solution, Signature can compare the behavioral data findings against other pertinent sources to uncover new insights that ultimately enhance and accelerate the drug discovery process."

Signature's goal is to deliver highly qualified pre-clinical leads for potential treatment of cancer and other diseases. An important initial application for Signature is the clustering, or classification, of small molecules and their interactions with either cells or proteins. This clustering is a statistical process that groups elements (cells, proteins or compounds) based on similarities in measured quantities. The interpretation of these clusters in biological terms is a crucial bioinformatics task.

"We are integrating novel detection technologies into a drug discovery platform designed to more quickly generate pre-clinical leads optimized for the highest probability of clinical success," said David Balaban, CIO and vice president of informatics and IT at Signature BioScience, Inc. "The ability to quickly and easily capture, integrate, and query across data from external sources helps further validate our internal findings and extend the critical knowledge base of interaction behaviors. geneticXchange's discoveryHub is a simple but powerful and scalable tool for tackling the enormous complexities of life science data integration."

The geneticXchange discoveryHub solution enables access to, and integration of, all life science data instantly, as if it were locally present. Using industry-standard technologies like SQL, users can perform complex, ad-hoc scientific queries and join multiple data sources in one productive workflow. This approach avoids the unnecessary step of bringing all the data into one monolithic data warehouse before drug discovery can begin.

About Signature BioScience, Inc.
Signature is a detection-based drug discovery company committed to efficiently delivering highly qualified pre-clinical leads for potential treatment of cancer and other diseases. The company is integrating its complementary screening technologies, MCS and Cytection™, with chemistries and informatics to create a novel drug discovery platform, WaveScreen™, which allows direct examination of a wide range of biologic activities. Signature offers access to WaveScreen on a fee-for-service basis, while internally using the platform to discover drug candidates for out-license to pharmaceutical and biotech partners prior to the clinical development stage. Signature's drug discovery efforts are currently focused on three research-stage programs, two in cancer and one against an infectious disease target, as well as on PC4071, a compound that is being studied in two Phase II trials, for the treatment of ovarian cancer and soft tissue sarcoma. The company is also globally commercializing its MCS-based WaveSpec™ instrumentation in collaboration with its partner MDS Sciex. Signature employs more than 140 biologists, chemists, engineers, computer scientists and support staff in its lab and office facilities in the San Francisco Bay Area.

About geneticXchange
geneticXchange provides the onlysystem data integration platform to help accelerate the drug discovery process. geneticXchange's powerful discoveryHub software provides rapid, real-time access to, and integration of, complex dispersed scientific data. The result is increased productivity, reduced risk and accelerated time-to-market for biotech and pharmaceutical companies. World leaders such as the Genome Institute of Singapore, Genomics Collaborative Inc., and Signature BioScience leverage discoveryHub to help realize the promise of "InSilico" Drug Discovery. geneticXchange is headquartered in Menlo Park, Calif., and can be reached at , info or geneticXchange.com.

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WaveScreen, WaveSpec and Cytection are trademarks of Signature BioScience, Inc. All other trademarks are the property of their respective owners.

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geneticXchange, Inc.

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