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The initial tumor cluster (red; ϕT = 0.5 isosurfaces) and BM geometries (green; ψ = 0.5 isosurfaces) in a branched duct in 3D. Left: 3D geometry, Right: a two-dimensional cross-section along the center plane z = 10. As in 2D, the membrane thickness is modeled by explicit representation of the inner and outer boundaries.
