PerkinElmer Commences Cash Tender Offer for ViaCell

   WALTHAM & CAMBRIDGE, Mass.--Oct. 12, 2007--On October 12, 2007,
Victor Acquisition Corp., an indirect wholly owned subsidiary of
PerkinElmer, Inc. (NYSE: PKI), commenced a tender offer to acquire all
outstanding shares of common stock of ViaCell, Inc. (Nasdaq: VIAC), at
a price of $7.25 per share, in cash, pursuant to a previously
announced Agreement and Plan of Merger among PerkinElmer, Inc., Victor
Acquisition Corp. and ViaCell, Inc., dated October 1, 2007.

   Victor Acquisition Corp.'s obligation to accept for payment and
pay for shares of ViaCell common stock tendered in the offer is
subject to customary conditions, including, among other things:

   --  at least a majority of the outstanding shares of ViaCell
       common stock on a fully diluted basis shall have been validly
       tendered in accordance with the terms of the offer and not
       properly withdrawn; and,

   --  the expiration or termination of applicable waiting periods
       under the United States Hart-Scott-Rodino Antitrust
       Improvements Act.

   The tender offer and any withdrawal rights to which ViaCell's
stockholders may be entitled will expire at 12:00 midnight, New York
City time, at the end of November 8, 2007, unless the offer is
extended.

   The complete terms and conditions of the tender offer are set
forth in the Offer to Purchase, Letter of Transmittal and other
related materials filed by PerkinElmer with the SEC on October 12,
2007. ViaCell filed a Solicitation/Recommendation Statement on
Schedule 14D-9 with the SEC on October 12, 2007, relating to the
tender offer. Copies of the Offer to Purchase, Letter of Transmittal
and other related materials are available free of charge from
Georgeson, Inc., the Information Agent for the tender offer, toll-free
at (888) 821-2250 (banks and brokers at (212) 440-9800), or Merrill
Lynch & Co., the Dealer Manager for the tender offer, at (877)
653-2948, toll-free. Deutsche Bank Trust Company Americas is acting as
Depositary for the tender offer.

   Securities Law Disclosure

   This press release is for informational purposes only and is not
an offer to buy or the solicitation of an offer to sell any
securities. The solicitation and the offer to buy shares of ViaCell
common stock are being made only pursuant to the Offer to Purchase,
Letter of Transmittal and related materials that PerkinElmer, Inc. and
Victor Acquisition Corp. have filed with the SEC on a Tender Offer
Statement on Schedule TO on October 12, 2007. ViaCell also has filed a
Solicitation/Recommendation Statement on Schedule 14D-9 with respect
to the offer on October 12, 2007. ViaCell stockholders and other
investors should read these materials carefully because they contain
important information, including the terms and conditions of the
offer. ViaCell stockholders and other investors may obtain copies of
these materials without charge from the SEC through the SEC's Web site
at http://www.sec.gov/, from Georgeson, Inc., the information agent for the
offer, toll-free at (888) 821-2250 (banks and brokers at (212)
440-9800), from Merrill Lynch & Co., the Dealer Manager for the tender
offer, at (877) 653-2948, toll-free, from PerkinElmer by directing a
request to PerkinElmer, 940 Winter Street, Waltham, Massachusetts
02451, Attention: Michael A. Lawless, Vice President, Investor
Relations or from ViaCell, Inc., 245 First Street, Cambridge,
Massachusetts, 02142, Attention: Justine Koenigsberg, Senior Director,
Corporate Communications. Stockholders and other investors are urged
to read carefully those materials prior to making any decisions with
respect to the offer.

   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 proposed transaction, 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.

   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. PerkinElmer, Inc. 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. ViaCell 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. ViaCell 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
            Media Contact:
            Kevin J. Lorenc, 781-663-5701
            or
            ViaCell
            Investor and Media Contact:
            Justine E. Koenigsberg, 617-914-3494