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With
this release, scientists can avoid several drawbacks faced with existing RNAi
tools.
Open Biosystems develops, manufactures and markets genomic research tools
to scientists in academic, government and industrial laboratories.

About CSHL
CSHL is a research and education institution with research programs
focusing on cancer, neurobiology, plant genetics, genomics and bioinformatics,
and a broad educational mission , including the Watson School of Biological
Sciences. "This detection technology allows us to continue to offer
superior labeling technologies to our customers, and leverages our
strong position as a market-leading provider of antibodies to
thousands of researchers worldwide. ST.
"Sigma is extremely pleased to be able to meet both the specialty and
routine chemistry and bioscience needs of MedAssets' members," said George
Crowell, Sigma-Aldrich Market Segment Manager.com . Proprietary information technology is used to work with and improve
existing IT assets and work processes.

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Troy Moore, Chief Technology Officer at Open Biosystems, said, "Expression
Arrest shRNA will enable researchers worldwide to unravel complex genetic
networks at their benchtop- greatly facilitating the validation of new drug
targets"
Created by Greg Hannon (CSHL) and Steve Elledge (Harvard ), the Expression
Arrest human whole genome shRNA collection targets over 30,000 genes with
multiple shRNA constructs per gene and all protein classes including those
considered druggable targets.com .
For more information, please visit our website: www. Our customers include researchers at major
life science companies and leading research institutions involved in
key disciplines, such as neurology, oncology, hematology, immunology,
cardiology, proteomics, infectious diseases, cell signaling and stem
cell research.

Sigma-Aldrich operates in 35 countries and has over 6,800 employees providing
excellent service worldwide.

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Linton, President of
Chemicon. Acquired in 2003 , Chemicon
is a Serologicals company, based in Temecula, CA.
Serologicals employs a total of more than 1,000 people worldwide in
three Serologicals' companies: Chemicon International, headquartered
in Temecula, CA, Upstate Group, LLC, headquartered in Charlottesville,
VA and Celliance Corporation , headquartered in Atlanta, GA.

About MedAssets
MedAssets, headquartered in Atlanta , Georgia, improves healthcare
providers' margin and cash flow through revenue cycle and supply chain
initiatives.

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Additional features unique to Expression Arrest shRNA include built-in
molecular barcodes allowing rapid and large-scale RNAi screens, the ability to
effectively deliver into difficult -to-transfect cell lines, and greater gene
knockdowns due to the micro-RNA based design. These
research tools provide investigators with standardized high-quality genes,
RNAi and antibodies for interrogating gene function in relation to oncology,
neuroscience and metabolic disorders.

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Complete Coverage of the Human Genome With 'microRNA Adapted' shRNA: Ready-to- Use Comprehensive RNA Interference (RNAi) Resource

This whole genome RNAi offering extends
Open Biosystems' portfolio of genomic products , utilized by investigators
worldwide, in assigning function to disease-causing genes and delineating the
molecular networks in which they function.
Established in 2004, the MedBasics product line consists of more than
3,000 of the most popular products used by medical testing laboratories on a
frequent basis as routine reagents. MedAssets, through its revenue cycle
subsidiary MedAssets Net Revenue Systems, provides best-of-breed revenue
solutions including strategic pricing, pre-bill charge capturing, and ongoing
chargemaster management tools, all of which have been Peer Reviewed by the
Healthcare Financial Management Association.

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Chemicon is recognized as a worldwide leader in
providing specific antibodies, kits and ancillary reagents for the
detection of antigen targets in the neuroscience, stem cell, cancer,
in vitro diagnostics, and other fields. LOUIS, Sigma-Aldrich
(Nasdaq: SIAL), a leading life science and high technology company, announces
an agreement with MedAssets Supply Chain Systems to distribute its MedBasics
products to MedAssets' customer base.

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In addition, Serologicals is the world's leading
provider of monoclonal antibodies for the blood typing industry.
Serologicals is a registered trademark of Serologicals Royalty
Company.

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Its biochemical and organic chemical products and kits are
used in scientific and genomic research, biotechnology , pharmaceutical
development, the diagnosis of disease and as key components in pharmaceutical
and other high technology manufacturing.

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About Open Biosystems, Inc.

Chemicon International Inc . Licenses Quantum Dot Antibody Reagent Line from Quantum Dot Corporation

serologicals.

Sigma-Aldrich and MedAssets Announce Agreement

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Chemicon International, Inc. QDC's current
products include life-science kits and applications used by academic
and pharmaceutical-discovery laboratories worldwide . "This is an excellent
opportunity for Sigma to demonstrate its world-class quality, service and
products to these customers. For more information about Sigma-Aldrich, please visit its award-
winning web site at http://sigma-aldrich. MedAssets, through its supply
chain subsidiary MedAssets Supply Chain Systems, operates the fastest growing
group purchasing organization and supply chain services company in the U.

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When conjugated to antibodies
these particles offer a unique light-based methodology for the
detection of specific biochemical targets in biological samples.
For more information , please visit our website:
www. These risks and uncertainties include,
without limitation, the value of the licensed research tools and the
utility of the licensed research tools to researchers . You should not
place undue reliance on forward-looking statements, since the
statements speak only as of the date that they are made, and the
Company undertakes no obligation to update these statements based on
events that may occur after the date of this press release.

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Now scientists can use Expression Arrest shRNA to perform transient, stable,
and in vivo RNAi studies, unlike siRNA which allows transient-only studies.com

Quantum Dot Corporation is a privately held bioscience company
that has pioneered the development and commercialization of Qdot(R)
nanocrystals for bio -detection in discovery and clinical applications. These statements are
subject to certain risks and uncertainties that could cause actual
results to differ materially from those expressed in any
forward -looking statements.

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Dunbar, President and CEO of Quantum
Dot Corporation.com

This release contains certain forward-looking statements within
the meaning of the Private Securities Litigation Reform Act of 1995.com or contact Gary Johnson, vice president of Marketing
and Marketing Services , 100 North Point Center East, Suite 200, Alpharetta, GA
30022.

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, Open Biosystems, Inc.openbiosystems . In addition, MedAssets offers the
only technology enabled system that links supply cost data with charge data to
ensure accurate charges and defendable markups for all patient identifiable
supplies , including costly medical devices.

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The Expression Arrest human genome shRNA library
will begin shipping by June 10th 2005 while the mouse whole genome shRNA
library will be completed by August 2005. For more information, visit Open
Biosystems' website: http://www. These nanometer-sized Qdot
particles have unique, highly desirable properties that make them a
superior detection platform for biology. QDC collaborates
with leading academic and industrial partners and has over 130 patents
and patents-pending."

About Sigma-Aldrich: Sigma-Aldrich is a leading Life Science and High
Technology company. The Company has customers in life
science companies, university and government institutions, hospitals, and in
industry.medassets.

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Already adopted by many of the leading cancer centers worldwide, the
Expression Arrest shRNA libraries provide researchers immediate access to
ready-to-use RNAi triggers against the entire human and mouse genomes. The most significant improvement is the added flexibility versus siRNA.

Business Editors/Biotech Writers
BIOWIRE2K

ATLANTA + HAYWARD, Calif.S.

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com

CONTACT: Troy Moore, Chief Technology Officer, 256-704-4848,
tm@openbiosystems .

Quantum Dot Corporation and collaborators have successfully
demonstrated the application and benefits of quantum dot-conjugated
antibodies in a variety of applications. offers a broad range of research
products, including specialty reagents, kits, antibodies, and custom
products and services, to customers working in the areas of
neuroscience, stem cell biology, cancer, and infectious disease
research.chemicon. Over one million scientists and technologists use its products.

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Chemicon will offer these
products through its direct sales team in North America, Australia, UK
and much of Europe, as well as through its worldwide network of
distributors. It is also a leading supplier of monoclonal antibodies,
conjugates, antibody blends and molecular-based detection kits for use
in diagnostic laboratories.qdots. The Company is committed to Accelerating the
success of its Customers through leadership in Life Science, High Technology
and Service.

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HUNTSVILLE, Ala. Gregory Hannon's laboratory at CSHL has pioneered efforts in
elucidating the role of RNAi in vivo and developing research tools for
applying RNAi technologies to drug development processes. As a strategic business partner, MedAssets can replace multiple
vendors and decrease supply costs by 3-10% and increase net patient revenue by
1-3 %.

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Dr.

CONTACT: Cold Spring Harbor Technology Licensing, 516-367 -6885. We are happy to be able to access the
significant commercial infrastructure of Chemicon to quickly expand
our user base," said George S.
Words or phrases such as "should result," "are expected to," "we
anticipate," "we estimate," "we project" or similar expressions are
intended to identify forward-looking statements.

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This agreement will add
novel secondary antibody detection technologies to Chemicon's general
reagents product portfolio. Researchers will be able to use these
products for the study of antigen presence in a variety of tissue and
cell culture samples. Chemicon focuses on basic and biomedical
research, drug discovery, and diagnostics, allowing it to serve
thousands of customers worldwide in the academic, clinical,
biotechnology, and pharmaceutical sectors.

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announced
today the imminent completion of its Expression Arrest(TM) Whole Genome human
short hairpin RNA (shRNA) library.----Chemicon International, a subsidiary of Serologicals Corporation
(NASDAQ: SERO ), and Quantum Dot Corporation (QDC) today announced the
signing of an agreement granting Chemicon rights to market specific
quantum dot-containing products for the detection of antibody-antigen
interactions in immunological experiments.
"Chemicon is very pleased to be selling Chemicon-branded quantum
dot secondary antibodies," said Jeffrey D.
QDC also markets and sells an integrated instrumentation, software,
and bio-reagents platform, the Mosaic(TM) system, for rapid and
quantitative multiplexed gene expression analysis. Products include buffers, cell culture
reagents, histology stains, immunology reagents, laboratory equipment,
molecular biology reagents, solvents as well as many others.
and builds customized solutions encompassing procurement of common medical
supplies, pharmaceuticals , physician preference supplies, food and nutrition
items, and capital equipment. For more information about MedAssets go to
http://www.

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Quantum dot (Qdot)(R)
nano-particles are tiny semiconductor crystals that emit light
brightly in a range of sharp colors."
"This agreement is an important step in the commercialization of
our Qdot nanocrystal technology.com

Serologicals Corporation (NASDAQ: SERO), headquartered in Atlanta,
GA, is a global leader in developing and commercializing consumable
biological products, enabling technologies and services in support of
biological research , drug discovery, and the bioprocessing of
life-enhancing products.
More information can be found at www.