definiens: shall mean a Blood Screening Assay, Clinical Diagnostic Assay, BloodScreening Instrument, Clinical Dillgnostic Instrument or Rare Reagent1.52 shall mean, with respect to any Blood Screening Assay orClinical Diagnostic Assay, the following royalty:1.51 shall mean, with respect to any Blood Screening A1;say orGinical Diagnostic . Assay, those enzymes, nucleic acids ( probes and primers ), . bUffers, targetcaptl1\"eparticles and other biochemical componeIitsand reagents .which.are necessary tomanufacture or conduct suchTMA A1;sayand -(a)are not generally available from oilier sourcesfor such uSe, or ( b)'if generally available frOQJother sourceS fo ~ such lise, areSubject to purchaseCommitments by Gen - Probe . ..