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A) Process flow overview for fabrication of multi-layer PEGMA laden SU-8 microdevice. B) A fluorescent micrograph composite of a layered hydrogel prepared with DNP-BSA, FITC-BSA and Texas-red-BSA (from outmost layer to inmost). The grey dotted-line box highlights the reservoir area and the red dotted-line box the outer area of the microdevice. C) A fluorescent micrograph of each individual filter for the labeled BSA is presented for three unique hydrogel-filled microdevices.
