definiens: , as further defined in the Services Agreement ) ; WHEREAS, the Parties entered into the First Amendment to the Original Services Agreementeffective December 21, 2017 ( the ) to provide for Atara ’s [ * ] certain Services atManufacturer ’s facility ; WHEREAS, the Parties entered into the Second Amendment to the Original Services Agreementeffective May 4, 2018, and subsequently amended and restated effective November 4, 2018 ( collectively, the ) to further revise certain terms of the ServicesAgreement ; WHEREAS, the Parties entered into the Third Amendment to the Original Services Agreementeffective June 28, 2019 ( the ) to further revise certain terms of the ServicesAgreement ; WHEREAS, the Original Services Agreement, as amended by the First Amendment, theAmended and Restated Second Amendment, and the Third Amendment are collectively referred to in thisFourth Amendment as the ; WHEREAS, the Parties have agreed to further amend the Services Agreement to revise the [ * ] of the Services Agreement [ * ], extend the Term of the Services Agreement, and revise certain otherterms of the Services Agreement ; and WHEREAS, Section 15.7 of the Services Agreement provides that the Services Agreement mayonly be modified by a writing signed by authorized representatives of each Party