Fig. 4. Microfluidic gradient generator fabricated using LCD 3D printing.

a Schematic of microfluidic gradient generator. b Dextran gradient produced by perfusing at 0.4 μL/min (top) and 50 μL/min (bottom). c Intensity of fluorescent dextran measured in each channel for tested flow rates. d Fluorescent beads flowing through gradient generator at 2 μL/min (left) and 50 μL/min (right). Scale bars represent 1 mm