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Negative ion mode desorption electrospray (DESI) mass spectra obtained from (A) imprinted OSX-C polymer (unused) and (B) glutaraldehyde-inactivated E. coli-GFP on Thermanox (template). 1: palmitic acid, 2: stearic acid, b: background. Inset: schematic diagram of DESI-MS setup.
