Cellexus Biosystems reports the Granting of Fundamental Technology UK Patent

PRESS RELEASE

February 13th 2008

The Board of Cellexus Biosystems plc (PLUS Markets: CBIO), the specialist in the design, manufacture
and commercialisation of novel disposable technology for growing cells, announces that the Company has
been issued with the British patent GB2433216 covering the core technology for the CellMaker family of
disposable bioreactor and fermentor products.

(1) GB2433216. Cellexus Biosystems plc. Inventor: Auton, K.A. Cell Culture Vessel

Commenting on this granting by the UK Patent Office, the inventor of the CellMaker technology, Dr
Kevin Auton, commented:

"The grant of this first patent for the Cellexus technology is an important milestone for Cellexus
Biosystems as it provides us with the protection we require to exploit our position in cell culture
and fermentation and validates the novelty of our single-use bioreactor and fermentors. We now
routinely demonstrate that the CellMaker technology is as effective as a traditional stirred
bioreactor, even for fermentation, which requires high rates of oxygen transfer. High mass transfer
of oxygen is achieved without moving parts and is a result of the unique bioreactor geometry. This
patent will be filed in all major markets and has already been filed in the US".

More information about the core technology surrounding the CellMaker technology and other disposable
systems can be can be found on the web site

http://www.cellexusbiosystems.com/index_files/Cellmakerlitedisposablebioreactortechnology2.htm

Ends

Further information:

Cellexus Biosystems plc:
Dr Kevin Auton
Chief Operations Director
12 Ramsay Court, Hinchingbrooke Business Park
Huntingdon, Cambridgeshire PE29 6FY
United Kingdom
Tel: +44 1480 451 499
kevin.auton@cellexusbiosystems.com
www.cellexusbiosystems.com

Media enquiries:
Bishopsgate Communications Ltd.
Nick Farmer
+44 (0)20 7562 3350
cellexus@bishopsgatecommunications.com

Trade Press enquiries:
Jessica Auton
+44 1480 352 821
jessica.auton@cellexusbiosystems.com

Notes to editors:

Cellexus Biosystems sells high performance, single-use, bioreactors to the biopharmaceutical
industry. Our products have proven performance advantages and save our customers time, expense and
reduce risk. Biopharmaceuticals are molecules made by cells cultured in vessels called bioreactors.
Reducing the time to market is driving every biopharmaceutical company to adopt single-use
technologies. These are less expensive to buy, faster to adopt and have shorter turnaround times
between experiments or batches.

The bioreactor systems we sell are: the CellMaker Lite2(TM) (for bacteria and yeast cells) and the
CellMaker PLUS(TM) (a highly sophisticated system for mammalian and insect cells, in addition to
bacteria and yeast). The single-use element is a medical-grade bag in which the cells are
cultured. There are two variants of these cell culture bags: CellexusBag(TM) (bacteria and yeast
cells) and the HybridBagTM (bacteria and yeast cells mammalian cells and insect cells).

Our vision is to be a major supplier of single-use technologies to the biopharmaceutical industry,
provide cutting-edge technologies and to be recognized as a consistent innovator in our vertical
market. The Company has a wholly owned Subsidiary in the USA. The majority of our products are
purchased by customers in the USA and EU.

Images of the CellMaker family of products can be downloaded from the Company's website

http://www.cellexusbiosystems.com/index_files/CellexusBiosystemsMediaResources.htm

Cellexus Biosystems PLC

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