FOR IMMEDIATE RELEASE

December 11, 2003

Guava Technologies: Early detection of cell health.

Guava Technologies has released a new technical paper on its ViaCount assay and its advantages over Trypan Blue-exclusion staining.

The paper illustrates Life Science researchers can accelerate their research by detecting cell health earlier using their unique ViaCount assay. Using Guava's proprietary ViaCount assay, biologists can now get a more complete assessment of the health of living cells employed in research and biopharmaceutical production than is possible using the standard approach of Trypan Blue-based dye exclusion. By enabling biologists to accurately detect and quantify apoptotic cells simultaneously with their analysis of cell viability, Guava Technologies' ViaCount assay enables users to detect problems in cell cultures much earlier, saving time and money.

Copies of the paper entitled 'A Better Alternative to Traditional Methods for Cell Counting and Viability Assessments' can be downloaded direct from www.guavatechnologies.com

CONTACTS:

Worldwide Headquarters Guava Technologies 25801, Industrial Boulevard Hayward, CA 94545-2991 USA www.guavatechnologies.com

EUROPE: Dr Bill Bradbury tel.: 44-208-546-0869 email: wbprimetek@aol.com N.AMERICA: Marie Martin tel.: +1-510-576-1427 email: mmartin@guavatechnologies.com Joan Kureczka tel.: +1-415-821-2413 email: jkureczka@aol.com