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MALDI-TOF mass spectra of the 8 pM samples of SOS (panel A) and Arixtra (panel B) in 70 mg/mL ImCHCA matrix acquired in the negative-ion mode using 45 μJ/pulse laser energy setting. Both analytes were detected without searching for a good spot and produced stable signals during the 100-shot acquisition scans. Peaks due to the matrix are marked with triangles.
