Taking shape: The 3D arrangement of a biomimetic fluorapatite–gelatine composite consists of elementary dipoles on the nanometer scale. The dipole field developed during growth of the composite causes formation and inclusion of gelatine microfibrils, which line up in the direction of the developing electric field. This microfibril pattern is the intrinsic code for development from an elongated hexagonal prism into a dumbbell morphology (see picture).
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