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Schematics and images of the fabricated BBB-on-a-chip device. (a) Top view schematic of the device and the positions of the channels. (b) Cross-sectional view schematic of the fabricated device and the channel dimensions. (c) Images of the fabricated device, with different colored dyes used to visualize the various channels. The hydrogel channel is shown in yellow, the BMEC channel in orange, and the medium channels adjacent to the hydrogel channel in blue.
