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Protein Tomography(TM) Reveals Molecular Mode of Action of Humax-EGFr Published in PNAS

STOCKHOLM, April 22 /PRNewswire/ --

- Summary: Using Protein Tomography(TM), Sidec Investigated in Collaboration With Genmab the Molecular Mode of Action of Humax- EGFr (Zalutumumab). In This Study Sidec Showed That EGFr is Flexible and That Zalutumumab Locks the EGFr Into a Very Compact Inactive Conformation Thereby Inhibiting Cell Signaling and Cancer Cell Growth.

Sidec AB announced today that together with Genmab the molecular mode of action of HuMax-EGFr (zalutumumab) has been determined. It was shown that zalutumumab locks the epidermal growth factor receptor (EGFr) molecules into a compact, inactive conformation. Flexibility is crucial to the role of the EGFr in signaling, and this study, done with Sidec's proprietary methodology Protein Tomography(TM), has played a central role in the understanding of the inhibition of individual EGFr molecules. Moreover, Sidec's unique technology confirmed that HuMax-EGFr binds bivalently to the EGFr. Prevention of the receptor dimerization as well as locking the EGFr molecules in the inactive form both contribute to the inhibition of signaling and cancer cell growth.

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This data will be demonstrated on Sidec's First Protein Tomography Symposium at the fourth annual PEGS Summit 28 April - 2 May at the Intercontinental Hotel in Boston.

With Protein Tomography it is possible to study the molecular mode of action of individual molecules in situ and in vitro. The unique biological information obtained can also be used to prioritize the most promising monoclonal antibodies/projects and to locate the antibody binding epitope.

"These results clearly show the importance of understanding the molecular mode of action and to capture the flexibility of a receptor when developing therapeutic antibodies. Today this can only be done with Protein Tomography(TM) and we are proud to have contributed to Genmab's new insight to HuMax-EGFr mechanism of action." says Hans Johansson CEO at Sidec AB.

The new findings will be published in the journal Proceedings of the National Academy of Science of the United States of America (PNAS) in the edition published on April 21, 2008

About Sidec

Sidec studies molecular interactions in situ and in vitro using its proprietary technology Protein Tomography(TM). Sidec AB offers collaboration research projects to the biopharmaceutical industry and reveals unique information to prioritize the most promising therapeutic antibody and to locate the antibody binding epitope.

For more information, please contact:

Mr.Hans Johansson, CEO

Phone: +46(0)8-4777-602

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