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Color-coded heterogeneous constructs. (A and B) Dynamically altering the proportion of different inks during printing. (C) Schematic of color-coded gel structure (10 layers) printed under different proportion of flow rate (Qtotal=600 µL/h, Qblue: Qyellow=0:1, 1:3, 1:1, 3:1, and 1:0) changed per two layers. (D, E, F, G, H) Photograph showing a gradient of colors from yellow to blue during printing. Scale bar=2 mm.
