Subject to the terms and conditions set forth herein and in the Amendment and Restatement Agreement No. 1, each Rollover Initial Term Lender severally agrees to exchange its Exchanged Term Loans for a like principal amount of Initial Term Loans on the First Restatement Effective Date. Subject to the terms and conditions set forth herein and in the Amendment and Restatement Agreement No. 1, each Additional Refinancing Term Loan Lender severally agrees to make an Additional Initial Term Loan (which shall be considered an increase to (and part of) the Initial Term Loans) to the Borrowers pursuant to a single drawing on the First Restatement Effective Date in the principal amount equal to its Initial Term Loan Commitment on the First Restatement Effective Date. The Borrowers shall prepay the Non-Exchanged Term Loans with a like amount of the gross proceeds of the Additional Initial Term Loans and the Unsecured Notes, substantially concurrently with the receipt thereof. The Borrowers shall pay to the Rollover Lenders immediately prior to the effectiveness of the Amendment and Restatement Agreement No. 1 all accrued and unpaid interest on the Term B-1 Loans to, but not including, the First Restatement Effective Date on such First Restatement Effective Date. The Initial Term Loans shall have the terms set forth in this Agreement and the other Loan Documents, including as modified by the Amendment and Restatement Agreement No. 1, it being understood that the Initial Term Loans (and all principal, interest and other amounts in respect thereof) will constitute “Obligations” under this Agreement and the other Credit Documents. The Initial Term Loans # shall be denominated in U.S. Dollars, # shall be, except as hereinafter provided, at the option of the Lead Borrower, incurred and maintained as, and/or converted into, one or more Borrowings of Base Rate Term Loans or LIBO Rate Term Loans, provided that except as otherwise specifically provided in Section 2.10(b), all Initial Term Loans comprising the same Borrowing shall at all times be of the same Type and # shall be made by each such Lender in that aggregate principal amount which did not exceed the Initial Term Loan Commitment of such Lender on the First Restatement Effective Date (before giving effect to the termination thereof pursuant to [Section 4.02(a)(i)]). Once repaid, Initial Term Loans may not be reborrowed.

Other Commitments. Except as otherwise agreed, it is further understood that Institute and the personnel performing the Research Collaboration may be or become involved in other activities and projects which entail commitments to other Third Parties (“Other Work”). The Principal Investigator and the personnel performing the Research Collaboration will use Commercially Reasonable Efforts to progress the Research Collaboration in accordance with terms of the Development Plan, including any timelines set forth therein. Institute and the personnel performing the Research Collaboration will each use their best efforts to avoid conflicts with the terms and obligations of this Agreement. The Principal Investigator will provide Atara with written notice as soon as practicable if he becomes aware of a conflict or potential conflict that may materially impose upon his ability to perform activities under the Development Plan and this Agreement. Nothing in this Agreement shall be construed to limit the freedom of Institute, or their researchers who are not participants in the Research Collaboration under this Agreement, from engaging in Other Work made under other agreements with other parties than Atara. Notwithstanding the foregoing, Institute and the Principal Investigator shall use all reasonable efforts to distinguish the research performed in connection with the Research Collaboration under this Agreement from all Other Work, and shall keep records pertaining to such Other Work separately from the records to be maintained pursuant to Article 8.

Subject to the terms and conditions hereof, each Lender severally agrees to make revolving credit loans (“Revolving Credit Loans”) to the Borrowers, without double-counting (i.e., amounts advanced by a Lender in respect of its Tranche A Commitment shall not be counted in reduction of its Tranche B Commitment, or vice versa) # in the case of Lenders with a Tranche A Commitment, in Dollars only, from time to time during the Commitment Period in an aggregate principal amount at any one time outstanding which, when added to such Lender’s Applicable Percentage of the then outstanding Tranche A L/C Obligations, does not exceed the amount of such Lender’s Tranche A Commitment, and # in the case of Lenders with a Tranche B Commitment, in Dollars or in an Alternate Currency, from time to time during the Commitment Period in an aggregate principal amount at any one time outstanding the Dollar Equivalent of which, when added to such Lender’s Applicable Percentage of the then outstanding Tranche B L/C Obligations, does not exceed the amount of such Lender’s Tranche B Commitment; provided that no Short Term Loan shall be available in an Alternate Currency. During the Commitment Period the Borrowers may use the Revolving Commitments by borrowing, prepaying the Revolving Credit Loans in whole or in part, and reborrowing, all in accordance with the terms and conditions hereof. Notwithstanding anything to the contrary contained in this Agreement, in no event shall, at any time, the sum of the Revolving Exposure of all of the Lenders plus the aggregate principal amount of outstanding Competitive Loans exceed the aggregate Revolving Commitments then in effect.

Incremental Commitments. Each Lender by its execution of this Amendment, hereby acknowledges, agrees and confirms its Commitment in the aggregate principal amount for such Lender as set forth on [Schedule 1.1(b)] attached hereto (which includes the Incremental Commitments for such Lender) and its obligation to make its portion of the Revolving Credit Loans to the Borrower from time to time in accordance with the provisions of the Credit Agreement. Each of the parties hereto acknowledges and agrees that, after giving effect to this Amendment, the total aggregate principal amount for all additional Incremental Commitments permitted to be established pursuant to [Section 4.13] of the Credit Agreement shall not (as of any date of incurrence thereof) exceed $30,000,000.

If any Defaulting Lender fails to respond to a request for a consent, waiver, amendment of or in relation to any term of any Finance Document or any other vote of Lenders under the terms of this Agreement within fifteen (30) Business Days (unless the Borrowers and the Agent agree to a longer time period in relation to any request) of that request being made:

Eligible Commitments. The Collateral Parties will cause, the net proceeds of any Eligible Commitment to be funded solely (as promptly as reasonably practicable) into # an Eligible Funding Account or # the Proceeds Account.

Affirmative Commitments. Except as set forth in [Section 7], during the Agreement Effective Period, the Company Parties agree to:

Negative Commitments. Except as set forth in [Section 7], during the Agreement Effective Period, each of the Company Parties shall not directly or indirectly:

During the Revolving Commitment Period, subject to the terms and conditions hereof, including, without limitation delivery of an updated Borrowing Base

Revolving Commitments. Subject to the terms and conditions hereof and relying upon the representations and warranties herein set forth, each Revolving Lender agrees, severally and not jointly, to make Revolving Loans to the Borrower in Dollars from time to time during the Availability Period in an aggregate principal amount that will not result in # such Revolving Lender’s Revolving Exposure exceeding such Revolving Lender’s Revolving Commitment, or # the Total Revolving Outstandings exceeding the Collateral Pool Availability. Within the foregoing limits and subject to the terms and conditions set forth herein, the Borrower may borrow, prepay and reborrow Revolving Loans. Revolving Loans may be ABR Loans or LIBOR Loans, as further provided herein.