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The 4000 QTRAP® LC/MS/MS System is SCIEX's premier Hybrid Triple Quadrupole/Linear Ion trap mass spectrometer. Ideal for drug discovery and development, metabolite identification, contaminant testing, and proteomic applications including post-translationally modified proteins discovery, protein identification, and biomarker validation.    SCIEX linear ion trap (LIT) technology enables unmatched quantitative and qualitative performance within a single system. Use of a quadrupole mass spectrometer as a linear ion trap significantly enhances ion trap performance by increasing ion capacity, improving injection and trapping efficiencies, and increasing duty cycle.