Validity; Enforcement. This Note has been duly and validly authorized, executed and delivered on behalf of such Holder and constitutes the legal, valid and binding obligations of such Holder enforceable against such Holder in accordance with their respective terms, except as such enforceability may be limited by general principles of equity or applicable bankruptcy, insolvency, reorganization, moratorium, liquidation and other similar laws relating to, or affecting generally, the enforcement of applicable creditors’ rights and remedies.

Specific Enforcement. The Parties acknowledge and agree that irreparable damage would occur in the event that any of the provisions of this Agreement were not performed in accordance with its specific terms or were otherwise breached. It is accordingly agreed that the Parties shall be entitled to seek one or more preliminary and final injunctions to prevent or cure breaches of the provisions of this Agreement and to enforce specifically the terms and provisions hereof, this being in addition to any other remedy to which any of them may be entitled by law or equity.

Enforcement Costs. In any legal action or other proceeding relating to this Agreement and the transaction contemplated hereby or if the enforcement of any provision of this Agreement is brought by any party against the other party, the prevailing party in such action or proceeding shall be entitled to recover all reasonable expenses relating thereto (including reasonable attorneys’ fees and expenses, court costs and expenses incident to arbitration, appellate and post-judgment proceedings) from the party against which such action or proceeding is brought, in addition to any other relief to which such prevailing party may be entitled.

Uniform Enforcement. In recognition of AT&T's need for nationally uniform standards for the Plan administration, it is an absolute condition in consideration of any Participant's ability to make Employee Contribution elections under Section 4.1 of this Plan after September 1, 2009, that each and all of the following conditions apply to all such electing Participants:

Authorization; Enforcement. This Agreement has been duly and validly authorized. This Agreement has been duly executed and delivered on behalf of the Buyer, and this Agreement constitutes a valid and binding agreement of the Buyer enforceable in accordance with its terms.

Authorization; Enforcement. (i) The Company has all requisite corporate power and authority to enter into and perform this Agreement, the Note and to consummate the transactions contemplated hereby and thereby and to issue the Securities, in accordance with the terms hereof and thereof, # the execution and delivery of this Agreement, the Note by the Company and the consummation by it of the transactions contemplated hereby and thereby (including without limitation, the issuance of the Note and the issuance and reservation for issuance of the Conversion Shares issuable upon conversion or exercise thereof) have been duly authorized by the Company’s Board of Directors and no further consent or authorization of the Company, its Board of Directors, or its shareholders is required, # this Agreement has been duly executed and delivered by the Company by its authorized representative, and such authorized representative is the true and official representative with authority to sign this Agreement and the other documents executed in connection herewith and bind the Company accordingly, and # this Agreement constitutes, and upon execution and delivery by the Company of the Note, each of such instruments will constitute, a legal, valid and binding obligation of the Company enforceable against the Company in accordance with its terms.

Authorization; Enforcement. [[Organization A:Organization]] has the requisite corporate power and authority to enter into and to consummate the transactions contemplated by this Agreement, and otherwise to carry out its obligations hereunder and thereunder. The execution and delivery of the Agreement by [[Organization A:Organization]] and the consummation by it of the transactions contemplated hereby and thereby have been duly authorized by all necessary action on the part of [[Organization A:Organization]] and no further action is required by [[Organization A:Organization]]. This Agreement has been (or upon delivery will have been) duly executed by [[Organization A:Organization]] and, when delivered in accordance with the terms hereof, will constitute the valid and binding obligation of [[Organization A:Organization]] enforceable against [[Organization A:Organization]] in accordance with its terms, except: # as limited by general equitable principles and applicable bankruptcy, insolvency, reorganization, moratorium and other laws of general application affecting enforcement of creditors’ rights generally, # as limited by laws relating to the availability of specific performance, injunctive relief or other equitable remedies and # insofar as indemnification and contribution provisions may be limited by applicable law.

Licensee Enforcement. In the event that either Licensee or Merck becomes aware of any alleged or threatened commercially material infringement in a country in the Territory of any issued patent within the Compound Patent Rights or Joint Patent Rights, it will notify the other Party in writing to that effect. Licensee shall have the first right (but not the obligation) to enforce any such Compound Patent Right or Joint Patent Right against any such infringer or alleged infringer, at its own expense, and control, and litigate and settle, such suit as set forth herein. Merck shall reasonably cooperate in any such suit at Licensee’s expense; and where necessary, Merck shall join in, or be named as a necessary party to, such suit. Licensee shall not enter into any settlement of any claim described in this Section 8.04(a) that, in the reasonable judgment of Merck would violate any law or regulation, admits to the invalidity or unenforceability of the Compound Patent Rights or Joint Patent Rights, incurs any financial liability on the part of Merck, requires an admission of liability, wrongdoing, or fault on the party of Merck, without Merck’s prior written consent (in each case, such consent not to be unreasonably withheld). Merck shall have the right, prior to commencement of the trial, suit or action brought by Licensee, to join any such suit or action, and in such event shall pay one-half of the costs of such suit or action.

Interpretation, Amendment and Enforcement. This letter agreement and Exhibit A constitute the complete agreement between you and the Company, contain all of the terms of your employment with the Company and supersede any prior agreements, representations or understandings (whether written, oral or implied) between you and the Company. This letter agreement may not be amended or modified, except by an express written agreement signed by both you and a duly authorized officer of the Company. The terms of this letter agreement and the resolution of any disputes as to the meaning, effect, performance or validity of this letter agreement or arising out of, related to, or in any way connected with, this letter agreement, your employment with the Company or any other relationship between you and the Company will be governed by California law, excluding laws relating to conflicts or choice of law.

Interpretation, Amendment and Enforcement. This Offer Letter and the Employee Non-Competition, Non-Solicitation, Confidentiality and Assignment Agreement constitute the complete agreement between you and the Company, contain all of the terms of your employment and supersede any prior agreements, representations or understandings (whether written, oral or implied) between you, the Company and/or Spero LLC. The terms of this Offer Letter and the resolution of any disputes as to the meaning, effect, performance or validity of this Offer Letter or arising out of, related to, or in any way connected with, this Offer Letter, your employment with the Company or any other relationship between you, the Company and/or Spero LLC (the “Disputes”) will be governed by Massachusetts law, excluding laws relating to conflicts or John F. Tomayko 502 Raspberry LN