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Analysis of rat brain tissue sections using (a) a DESI close to the MS inlet with MeOH/H2O (1:1) as spray solvent and a high voltage of −4.5kV and (b) a 4m probe with water as spray solvent and no high voltage. (c) Analysis of rat intestine using a 1m probe with water as spray solvent and no high voltage. Gas flow rate, 5.2 L/min for 4 m and 1m probes and 1.5 L/min for DESI.
