PerkinElmer to Expand Genetic
         Screening Business Through Acquisition of ViaCell

          Expands Neonatal Product Range and Clinical Reach

   WALTHAM, Mass. & CAMBRIDGE, Mass.--Oct. 1, 2007--PerkinElmer, Inc.
(NYSE: PKI), a global technology leader in Health Sciences, and
ViaCell, Inc. (Nasdaq: VIAC), a biotechnology company specializing in
the collection and preservation of umbilical cord blood stem cells,
announced today the signing of a definitive agreement under which
PerkinElmer plans to acquire ViaCell. The addition of ViaCell's
ViaCord(R) product offering for the preservation of umbilical cord
blood and its highly qualified sales and marketing organization are
expected to significantly expand PerkinElmer's offerings and reach in
neonatal and prenatal markets.

   Under the agreement, PerkinElmer will commence a cash tender offer
to purchase all of the outstanding shares of ViaCell for $7.25 per
share, for an aggregate purchase price of approximately $300 million,
or $260 million net of cash. The transaction is expected to close in
the fourth quarter of 2007. PerkinElmer anticipates this transaction
will be slightly dilutive to its non-GAAP 2008 adjusted earnings per
share, and accretive to its non-GAAP 2009 adjusted earnings per share.

   "ViaCell has built a high growth business based on innovative
umbilical cord blood preservation technology, with a strong,
established market presence," said Gregory L. Summe, Chairman and
Chief Executive Officer, PerkinElmer, Inc. "This is an important
investment to continue expanding our Genetic Screening business. We
are excited by the prospect of combining ViaCell with our existing
prenatal and neonatal screening services, with an enhanced ability to
reach obstetric professionals and prospective parents throughout the
United States."

   "PerkinElmer is the world leader in neonatal screening solutions,
with the ability to screen for more than 50 genetic disorders," added
Robert F. Friel, President and Chief Operating Officer, PerkinElmer,
Inc. "A growing number of disorders - which today includes blood
disorders, such as sickle cell anemia, and metabolic disorders - are
treatable using the cord blood stem cells gathered and preserved
through ViaCell's ViaCord offering. By bringing both the screening and
therapeutic benefits of these two businesses together, we can offer a
more comprehensive solution to patients and practitioners."

   "We are excited by the opportunity to increase access to our
products by leveraging PerkinElmer's global reach and resources," said
Marc D. Beer, President and Chief Executive Officer, ViaCell, Inc. "We
believe this transaction will maximize value to our shareholders while
continuing to accelerate the growth of the ViaCord business and the
progress of future product development."

   ViaCell offers significant expertise in the collection, testing,
processing and preservation of umbilical cord blood stem cells.
ViaCell has built a dynamic sales organization in the U.S. which calls
regularly on more than 17,000 obstetricians and interacts monthly with
hundreds of thousands of prospective parents. Currently, ViaCell
markets ViaCord, a product offering that allows expectant families the
opportunity to preserve their baby's umbilical cord blood at the time
of birth for potential medical use by the child or a related family
member. Cord blood has been shown to be effective in treating over 40
diseases including blood cancers and certain genetic diseases. To
date, ViaCord has preserved over 130,000 newborns' umbilical cord
blood. ViaCord sales are expected to be in the mid- to high-60 million
dollar range in 2007. It is estimated that the U.S. market for family
cord blood banking could reach more than $1 billion. PerkinElmer
anticipates divesting ViaCell's therapeutic businesses.

   In addition to newborn screening solutions, PerkinElmer continues
to build its genetic screening portfolio to provide the most accurate
assessment of fetal and maternal health to women and their healthcare
practitioners. PerkinElmer now offers Ultra-Screen(R), a
first-trimester prenatal screening protocol designed to provide
patient-specific risk assessment for certain chromosomal
abnormalities, through its NTD Laboratories division. The Company also
holds a global licensing agreement to develop assay kits for the
ADAM12 biochemical marker, which has broad potential in maternal
health screening for fetal chromosomal abnormalities, and has secured
global rights for Placental Protein 13 (PP13), a new maternal serum
marker currently under investigation that has shown potential for
early detection of preeclampsia in low-risk groups.

   The acquisition has been unanimously approved by the board of
directors of each company and is subject to customary closing
conditions, including clearance under Hart Scott Rodino.

   Related to the transaction, Merrill Lynch & Co. is acting as
financial advisor to PerkinElmer, and UBS Investment Bank is acting as
financial advisor to ViaCell. Wilmer Cutler Pickering Hale and Dorr
LLP is acting as legal counsel to PerkinElmer and Ropes & Gray LLP is
acting as legal counsel to ViaCell.

   Conference Call

   The management teams of PerkinElmer and ViaCell will be hosting a
conference call and simultaneous webcast to discuss the transaction
today, Monday, October 1, 2007, at 5:30 p.m. Eastern Time (ET). The
dial-in number is +1.617.213.8834 and the passcode is 89545028. To
access the webcast, go to the Investor Relations sections on
PerkinElmer's Web site at http://www.perkinelmer.com/ or ViaCell's Web site at
http://www.viacellinc.com/. A replay of the call will be available for seven
days by dialing +1.617.801.6888 and using the passcode 73366935, or by
accessing the Investor Information pages at http://www.perkinelmer.com/ or
http://www.viacellinc.com/.

   Important Additional Information Will Be Filed with the Securities
Exchange Commission (SEC)

   This press release is neither an offer to purchase nor a
solicitation of an offer to sell shares of ViaCell, Inc. PerkinElmer
has not commenced the tender offer for shares of ViaCell stock
described in this press release.

   At the time the tender offer is commenced, PerkinElmer will file
with the SEC and mail to ViaCell's stockholders a Tender Offer
Statement on Schedule TO and related exhibits, including the offer to
purchase, letter of transmittal and other related documents, and
ViaCell will file with the SEC and mail to its stockholders a Tender
Offer Solicitation/Recommendation Statement on Schedule 14D-9 in
connection with the transaction. These will contain important
information about PerkinElmer, ViaCell, the transaction and other
related matters. Investors and security holders are urged to read each
of these documents carefully when they are available.

   Investors and security holders will be able to obtain free copies
of the Tender Offer Statement, the Tender Offer
Solicitation/Recommendation Statement and other documents filed with
the SEC by PerkinElmer and ViaCell through the Web site maintained by
the SEC at http://www.sec.gov/. In addition, investors and security holders
will be able to obtain free copies of these documents by contacting
the Investor Relations departments of PerkinElmer or ViaCell.

   Cautionary Note Regarding Forward-Looking Statements

   Statements in this press release regarding the proposed
transaction between PerkinElmer and ViaCell, the expected timetable
for completing the transaction, future financial and operating
results, benefits and synergies of the transaction, future
opportunities for and expansion of the combined company, the expected
impact of the anticipated transaction on PerkinElmer's earnings, the
extent to which the transaction advances PerkinElmer's business,
expectations for growth of the family cord blood banking market and
the ViaCord business, the advancement of ViaCell's product candidates
and plans for ViaCell's therapeutic and research business, and any
other statements about PerkinElmer or ViaCell managements' future
expectations, beliefs, goals, plans or prospects constitute
forward-looking statements. Any statements that are not statements of
historical fact (including statements containing the words "believes,"
"plans," "anticipates," "expects," estimates and similar expressions)
should also be considered to be forward-looking statements. There are
a number of important factors that could cause actual results or
events to differ materially from those indicated by such
forward-looking statements, including: the possibility that certain
closing conditions to the transaction will not be met; the ability to
consummate the transaction, the ability of PerkinElmer to successfully
integrate ViaCell's operations and employees; the ability to realize
anticipated synergies and cost savings; and the other factors
described in PerkinElmer's Annual Report on Form 10-K for the year
ended December 31, 2006, and in ViaCell's Quarterly Report on Form
10-Q for the quarter ended June 30, 2007, each of which has been filed
with the SEC. Except as otherwise required by law, PerkinElmer and
ViaCell disclaim any intention or obligation to update any
forward-looking statements as a result of developments occurring after
the date of this press release.

   Use of Non-GAAP Financial Measures

   This announcement contains the non-GAAP financial measure
"adjusted earnings per share." PerkinElmer uses the term "adjusted
earnings per share" to refer to GAAP earnings per share, excluding
discontinued operations, amortization of intangible assets, inventory
fair value adjustments, in-process research and development charges,
deferred revenue adjustments, and other significant adjustments
related to business acquisitions, gains on settlement of insurance
claim, restructuring and lease charges, stock option expense and
certain other gains and losses. PerkinElmer believes that this
non-GAAP measure, when taken together with our GAAP financial measure,
allows it and its investors to analyze the costs of producing and
selling our products and the performance of its internal investments
in technology and internal operating structure, to evaluate the
long-term profitability trends of its core operations and to calculate
the underlying value of the core business on a dilutive share basis,
which is a key measure of the value of PerkinElmer used by its
management and it believes used by investors as well. Adjusted
earnings per share also facilitates the overall analysis of the value
of the Company and the core measure of the success of its operating
business model as compared to prior and future periods and relative
comparisons to its peers. PerkinElmer excludes discontinued
operations, amortization of intangible assets, inventory fair value
adjustments, in-process research and development charges and other
significant adjustments related to business acquisitions, gains on
settlement of insurance claim, restructuring and lease charges, stock
option expense and certain other gains and losses as these items do
not represent what PerkinElmer's management and what it believes its
investors consider to be costs of producing its products, investments
in technology and production, and costs to support its internal
operating structure, which could result in overstating or understating
to its investors the performance of its operations.

   About PerkinElmer

   PerkinElmer, Inc. is a global technology leader driving growth and
innovation in Health Sciences and Photonics markets to improve the
quality of life. The Company reported revenues of $1.55 billion in
2006, has 8,500 employees serving customers in more than 125
countries, and is a component of the S&P 500 Index. Additional
information is available through http://www.perkinelmer.com/ or
1-877-PKI-NYSE.

   About ViaCell

   ViaCell, Inc. is a biotechnology company dedicated to enabling the
widespread application of human cells as medicine. The Company markets
ViaCord, a product offering through which families can preserve their
baby's umbilical cord blood at the time of birth for possible future
medical use in treating over 40 diseases including certain blood
cancers and genetic diseases. The Company is also working to leverage
its commercial infrastructure and product development capabilities by
developing ViaCyte(SM), a product candidate being studied for its
potential to broaden reproductive choices for women through the
cryopreservation of human unfertilized eggs. ViaCell also conducts
research and development primarily to investigate other potential
therapeutic uses of umbilical cord blood-derived stem cells and on
technology for expanding populations of these cells. ViaCell's
pipeline is focused in the areas of cancer, cardiac disease, and
diabetes. Additional information about ViaCell is available online at
http://www.viacellinc.com/. Additional information about ViaCord is
also available at http://www.viacord.com/.

   --30--

   CONTACT: PerkinElmer Investor Contact:
            Michael A. Lawless, 781-663-5659
            or
            PerkinElmer Media Contact:
            Kevin J. Lorenc, 781-663-5701
            or
            ViaCell Investor and Media Contact:
            Justine E. Koenigsberg, 617-914-3494