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Chromatogram showing (a) pure 0.1 μg/mL CS in PBS (b) receptor solution of PBS in the blank in vitro permeation study after 24 h set up with TIC1 = m/x 467 and TIC2 = m/z 379 Abbreviations: CS, cromolyn sodium; PBS, phosphate buffered saline; TIC, total ion chromatogram.
