Provisions of the Plan. This PSU award is subject to the provisions of the Plan. The Participant acknowledges receipt of the Plan, along with the Prospectus relating to the Plan.

Provisions of Plan Control. This grant is subject to all the terms, conditions and provisions of the Plan, including, without limitation, [Section 17.13] of the Plan (Section 409A of the Code) and the amendment provisions of the Plan, and to such rules, regulations and interpretations relating to the Plan as may be adopted by the Board of Directors of the Company and as may be in effect from time to time. Any capitalized term used but not defined herein shall have the meaning ascribed to such term in the Plan. The Plan is incorporated herein by reference. If and to the extent that this grant conflicts or is inconsistent with the terms, conditions and provisions of the Plan, the Plan shall control, and this grant shall be deemed to be modified accordingly.

This option is subject to the provisions of the Plan (including the provisions relating to amendments to the Plan), a copy of which is furnished to the Participant with this option.

Incorporation of Plan Provisions. These Terms and Conditions and the Agreement are made pursuant to the Plan, the provisions of which are hereby incorporated by reference. Capitalized terms not otherwise defined herein shall have the meanings set forth for such terms in the Plan. In the event of a conflict between the terms of these Terms and Conditions and the Agreement and the Plan, the terms of the Plan shall govern.

Provisions of the Plan. Capitalized terms used herein and not defined herein shall have the meanings set forth in the Plan. This Agreement and the Award set forth herein shall be subject to and shall be governed by the terms set forth in the Plan, a copy of which has been furnished to Executive and which is incorporated by reference into this Agreement. In the event of any conflict between this Agreement and the Plan, the Plan shall control.

Stock Subject to the Plan. Subject to adjustment upon changes in capitalization of the Company as provided in Section 14, the maximum aggregate number of Shares that may be subject to Awards and sold under the Plan will be equal to # 1,000,000 Shares, plus # any Shares subject to awards granted under the Tocagen, Inc. 2009 Equity Incentive Plan, the Tocagen, Inc. 2017 Equity Incentive Plan, and the Forte Biosciences Inc. 2018 Equity Incentive Plan that, after the date of stockholder approval of the Plan, expire or otherwise terminate without having been exercised or issued in full, are tendered to or withheld by the Company for payment of an exercise price or for tax withholding obligations, or are forfeited to or repurchased by the Company due to failure to vest, with the maximum number of Shares to be added to the Plan pursuant to clause (b) equal to 1,102,341. In addition, Shares may become available for issuance under Section 3.2. The Shares may be authorized but unissued, or reacquired Common Stock.

Subject to such additional shares of Stock as shall be available for issuance under the Plan pursuant to Section 4.2, and subject to adjustment pursuant to Section 17, the maximum number of shares of Stock available for issuance under the Plan shall be equal to 65 million shares, plus the number of shares of Stock subject to awards outstanding under the Prior Plan as of the Effective Date which thereafter terminate by expiration, forfeiture, cancellation or otherwise without the issuance of such shares.

Stock Subject to the Plan. Subject to the provisions of Section 13 hereof, the shares of stock subject to Options or Stock Purchase Rights shall be Common Stock. Subject to the provisions of Section 13 hereof, the maximum aggregate number of Shares which may be issued upon exercise of such Options or Stock Purchase Rights is Twenty-Six Million Five Hundred Forty-Two Thousand Four Hundred Eighty-Three (26,542,483) Shares. Shares issued upon exercise of Options or Stock Purchase Rights may be authorized but unissued, or reacquired Common Stock. If an Option or Stock Purchase Right expires or becomes unexercisable without having been exercised in full, the unpurchased Shares which were subject thereto shall become available for future grant or sale under the Plan (unless the Plan has terminated). Shares which are delivered by the Holder or withheld by the Company upon the exercise of an Option or Stock Purchase Right under the Plan, in payment of the exercise price thereof or tax withholding thereon, may again be optioned, granted or awarded hereunder, subject to the limitations of this Section 3. If Shares of Restricted Stock are repurchased by the Company at their original purchase price, such Shares shall become available for future grant under the Plan (unless the Plan has terminated). Notwithstanding the provisions of this Section 3, no Shares may again be optioned, granted or awarded if such action would cause an Incentive Stock Option to fail to qualify as an Incentive Stock Option under Code Section 422.

Restricted Stock Subject to Plan. This Award is subject to the Plan as approved by the Company’s stockholders and as may thereafter be amended or modified in accordance with its terms. The terms and provisions of the Plan as it may be amended from time to time are hereby incorporated herein by reference. In the event of a conflict between any term or provision contained herein and a term or provision of the Plan, the applicable terms and provisions of the Plan will govern and prevail.

Stock Subject to the Plan. Awards that are made in the form of stock, restricted stock, stock units or other forms of stock-based awards shall be made from the aggregate number of shares authorized to be issued under the terms of the Stock Plan.