definiens: meaning a sa les volume of [ * * * ] % of the volume of competing License d Products or Licensed Assays of OXFORD IMMUNOTEC and/or sublicensees ), OXFORD IMMUNOTEC sh all have the right to give PHRI written notice thereof . The notice shall identify the infringer, t he infringing product or assay and the infringing s ales level, and shall include reasonable evidence of infringement a nd sales level . Upon receipt of such notice, PHRI s hall have 120 days in which to eliminate the infringement or commence suit for infringement . If PHRI does neithe r, OXFORD IMMUNOTEC shall have the option ( a ) to comme nce suit ( in PHRI ’s name, if necessary ) or ( b ) to take a [ * * * ] ( [ * * * ] % ) royalty reduction for its sal es in that country of directly competing Licensed P roducts or Licensed Assays until such time as such Substantial infringement is eliminated or PHRI commences suit against the infringer