definiens: of a Party, means information relating to the business, operations or products of a Party or any of its Affiliates, including any Know - How, that suc h Party, any of its Affiliates or any Third Party act ing on its behalf discloses to the other Party or a ny of its Affiliates under this Agreement, or information of a Party that otherwise becomes known to the oth er Party by virtue of this Agreement ; provided, that notwithstanding anything to the contrary, ( a ) Confidential Information constituting Mersana K now - How, Mersana Platform Know - How or Mersana Regulatory Documentation will be Confidenti al Information of Mersana ( and Mersana will be deemed the disclosing Party and [COMPANY] the receiving Party with respect thereto ) and ( b ) Confidential Information constituting [COMPANY] Know - How, Product Kn ow - How or [COMPANY] Regulatory Documentation will be Confidential Information of [COMPANY] ( and Merc k will be deemed the disclosing Party and Mersana the receiving Party with respect thereto ) . ” 1.2 Research Plans . Section 2.2.3 of the Original Agreement is hereby deleted in its entirety and replaced with the following : “ 2.2.3