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. 2019 Mar 21;35(4):293–332. doi: 10.1007/s10565-019-09468-6

Fig. 14.

Fig. 14

First reported study where MALDI-MSI was used to demonstrate localisation of a drug administered at therapeutic levels in humans. The study demonstrated that the ipratropium precursor ion (m/z 332.332) is rapidly absorbed into the airway wall partitioned within submucosal spaces containing the targeted airway smooth muscle