definiens: shall mean the immunizati on of XenoMouse Animals with the Antigen and the use of XenoMouse Animals that are so immunized and materials derived from XenoMouse Animals that are so immunized, in each case solely for the creation, identification, analysis, research, and preclinical de velopment of Products for use in the Field . For purposes of clarification, but without limitation, the Research Field shall not include ( i ) the creation, breeding or development of mice or any transgenic animals, ( ii ) use in humans o f materials derived in whole or part from the XenoMouse Animals ( including without limitation Products ), ( iii ) use of XenoMouse Animals or materials derived in whole or part from XenoMouse Animals ( including without limitation Products ) for screening or other research, or for an y purpose other than the creation, identification, analysis, research and development of Products for use in the Field, or ( iv ) the transfer, sale, lease, offer for sale or lease, or other transfer of title to or an interest in XenoMouse Animals or any mat erials derived in whole or part from the XenoMouse Animals ( including without limitation Products )