Document:

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ADDITIONAL STOCK  In addition, the Company shall grant to you additional
OPTIONS           options ("Performance Based Options") to purchase 50,000
                  shares of Common Stock. The exercise price of the options
                  will equal the fair market value of our Common Stock as
                  determined by the Board of Directors on your date of hire.
                  Such options to become exercisable as to 25% of the shares
                  on each of the fourth, fifth, sixth and seventh anniversary
                  of the date of grant; provided, however, that if at any
                  time within 24 months after the expiration of any lock-up
                  period imposed by the underwriters in connection with the
                  Company's initial public offering of Common Stock, the
                  average of the closing prices of the Company's common stock
                  over a period of 30 consecutive trading days, as reported by
                  the Nasdaq National Market, or any exchange on which the
                  Company's Common Stock is then traded, equals or exceeds
                  $26.00 per share, all of such shares shall become fully
                  vested and exercisable until the expiration of such options
                  or until they sooner terminate in accordance with their terms.
                  The Options shall have a term of ten years, and shall be
                  subject to the terms and conditions most recently approved by
                  the Board for use under the 1998 Equity Incentive Plan.

BENEFITS          Because we care about the well being of our employees, we are
                  pleased to provide you with comprehensive offering of
                  benefits. Our benefits currently include medical, dental,
                  life insurance, three weeks vacation (accrued weekly and
                  pro-rated during your first calendar year of employment),
                  balance benefit, educational assistance and flexible-spending
                  accounts. Additional information about these benefits is out-
                  lined in the enclosed summary.

ELIGIBILITY FOR   The Immigration Reform and Control Act of 1986 requires
EMPLOYMENT        ViaCell to review documentary evidence that you are
                  eligible for employment. This requirement applies to US
                  citizens, as well as foreign nationals. A list of approved
                  documents that are acceptable as verification of employment
                  eligibility are listed on page two of the I-9 form which will
                  be included with your orientation packet. Please bring the
                  appropriate documents with you on your first day of
                  employment.

EMPLOYMENT        While we look forward to a long and mutually beneficial
RELATIONSHIP      relationship, you acknowledge that this letter does not
                  constitute a contract of employment for any particular period
                  of time and does not affect the at-will nature of the
                  employment relationship with the company. Either you or
                  ViaCell have the right to terminate your employment at any
                  time.

We are very excited about the future of ViaCell and believe that the
opportunities presented will allow you significant personal and professional
growth. If you have any questions or concerns, please do not hesitate to
contact me anytime. We look forward to having you join our team!

Sincerely,

/s/ Marc Beer                            Start Date  1/14/02
----------------------
Marc Beer
Chief Executive Officer

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Please acknowledge your acceptance of this offer by signing a copy of this
document along with the Agreement Related to Intellectual Property and
Confidential Information and faxing it to Kristin Dickson at 617-247-6271. This
offer will remain in effect for a period of seven (7) calendar days from the
date of this letter.

/s/ Robert J. Silverman                      12/20/01
-------------------------------              -------------------------------
Signature                                    Date

[Intentionally omitted]                      1/14/02
-------------------------------              -------------------------------
Social Security Number                       Start Date<PAGE>
                                                                   Exhibit 10.12

December 15, 2001

Roland Scollay, PhD
Geneteric
2061 Challenger Drive
Alameda, CA  94501

Dear Roland:

Thank you for your commitment to being a member of ViaCell, Inc.'s Board of
Directors. I look forward to our working relationship and appreciate your
involvement in our company's mission to deliver the highest quality cellular
medicines for the treatment of human disease. This letter is to confirm our
agreement effective January 1, 2002 that ViaCell will compensate you as outlined
below:

         Fee for attending each Board of Directors meeting of $3,500 paid within
         30 days of the meeting. Additionally, you will be granted 5,000 shares
         of stock options, which will vest one year from the grant date.

         You will attend six Board of Director meetings (schedule attached)
         including a dinner the night before plus a half-day meeting.

         Occasional calls, emails and correspondence with the Chairman and CEO
         may be required.

ViaCell will reimburse you for miscellaneous travel expenses incurred on behalf
of the Company. Mary Landers will arrange your flights and the flight cost will
be billed directly to ViaCell. Other business expenses should be submitted to
Mary Landers. The Company will reimburse you in a timely fashion. I am confident
you will use good prudent business judgment as it relates to business travel
expenses.

It is further understood that while you are serving as a member of ViaCell's
Board of Directors, you will not serve as a consultant, employee, or in any
similar capacity with any entity or individual in competition with ViaCell, Inc.
and its Viacord Cord Blood Banking Service.

Sincerely,
/s/ Marc Beer

Marc D. Beer                               Agreed to by:
Chairman and Chief Executive Officer

                                           _____________________________________
                                           Roland Scollay, PhD              Date

Enclosure:
              2002 Board of Director Meeting Calendar<PAGE>

                                                                   Exhibit 10.13

                                    VIACELL(TM)

September 29, 2000

Mary Thistle
9 Longview Drive
Chelmsford, MA  01824

Dear Mary:

It is my sincere pleasure to offer you the position of Vice President, Financial
and Corporate Planning with ViaCell, Inc. This position will be a key factor in
ViaCell's continued success, and I am confident that it will be an exciting
opportunity for you as well.

As agreed, your scheduled start date is October 2, 2000. You will be compensated
for this position at the bi-weekly rate of $4,038.46 (this is the equivalent of
$105,000 based on 26 pay periods). Your performance will be reviewed annually,
beginning on your first anniversary date, and your salary may be adjusted at
that time.

As an employee of ViaCell, you will be entitled to 25,000 shares of ViaCell
stock options (valued at $0.30 per share, vested over four years), pending board
approval, and participation in our employee benefits program.

ACCELERATED VESTING OF OPTIONS. Should the Company terminate you without "Cause"
(as hereinafter defined) or you terminate your employment with the Company for
"Good Reason" (as hereinafter defined) within one year from your date of
commencement of full time employment with the Company, any options then held by
you to purchase shares of ViaCell Common Stock, which options are then subject
to vesting, shall, accelerate and become fully vested and exercisable as to 50%
of such options on the date of such termination.

"Cause" shall mean (i) your willful and continued failure to substantially
perform your assigned duties (other than any such failure resulting from your
incapacity due to physical or mental illness) after a demand for substantial
performance is delivered to you by the Chief Executive Officer or Chief
Financial Officer of the Company and not cured within 10 days of receipt of such
notice, (ii) a material breach by you of any Company policies; (iii) any act of
fraud, misappropriation, dishonesty, embezzlement or similar conduct by you
against the Company or any client of the Company, which would result in material
harm to the Company or (iv) any conviction of a felony (including a plea of NOLO
CONTENDERE).

"Good Reason" shall mean your assignment to duties inconsistent in any material
respect with your position, duties or responsibilities as contemplated by the
job description of your position, or any other action by the Company or its
successor, which results in a material diminution in such position, duties or
responsibilities, excluding for this purpose an isolated, insubstantial and

<PAGE>

inadvertent action not taken in bad-faith and which is remedied by the Company
promptly after it receives notice thereof by you.

A highlight of our benefits currently includes medical insurance, dental
insurance, long-term disability, life insurance, paid vacation, holidays and
sick days. If you choose to enroll in the health and/or dental plan, you will be
responsible for a portion (20%) of the premium cost, with pre-tax payment
arranged through payroll deductions. As they become available, additional
benefits may be added to your employment package. Details of all ViaCell's
benefit programs will be reviewed during our orientation meeting on your first
day of work.

This offer is contingent on your providing proof of eligibility for employment.
On your first day of employment, please bring with you either: a) a valid U.S.
Passport, or b) a birth certificate and driver's license, or c) an original
Social Security card and driver's license.

Please indicate your acceptance of this offer and your anticipated start date by
completing and signing this letter, along with the Agreement Related to
Intellectual Property and Confidential Information, and sending the original
copies to my attention. This offer will remain in effect for a period of seven
(7) calendar days from the date of this letter. Please feel free to call me if
you have any questions.

Mary, we look forward to having you join our team!

Sincerely,

/s/ Erin Quinn

Erin E. Quinn
Director, Human Resources

I ACCEPT YOUR OFFER OF EMPLOYMENT:

/s/ Mary Thistle
------------------------------------                 ---------------------
Signature                                       Date

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Social Security Number

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Anticipated Start Date

                                       2

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