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Comparison of a symmetric 3-generation model (g3; left) and an asymmetric 4-generation model (g4-asym; right). Both models have comparable lumen size and identical alveolar size. The top schematic was drawn 2 dimensionally (2D) and showed the relative positions of different branches (identified by numbers). The bottom panels showed the 3D shaded view (not to scale) of the models. The angles between successive bifurcation planes and the bifurcation angles are both 90°.
