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Visualization of self-distributing cell lines within coculture 3D cellular structures following formation. Confocal z-stack images showing regional distributions of MDA-MB-231 (blue) and fibroblast (green) cells in 3D cellular structures (a) printed with magnetic assistance and (b) formed through gravitational settling at 3, 7, and 14 days. The scale bar is equal to 100 μm.
