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(a) SEM image of the PtTPTBPF palladium base oxygen sensing dye integrated microparticles and the oxygen sensing integrated into the BBB chip. Reproduced with permission.[207] Copyright 2019, American Chemical Society. (b) Schematic representation of the BBB-on-a-chip integrated with the three-dimensional cell culturing setup, the micro solid-phase extractor, and the final electrospray ion mass spectrometry set-up. Reproduced with permission.[208] Copyright 2016, Elsevier.
