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Painting with Biomolecules at the Nanoscale: Biofunctionalization with Tunable Surface Densities Robert Schlapak†, Jürgen Danzberger‡, Thomas Haselgrübler†, Peter Hinterdorfer†§, Friedrich Schäffler‡, and Stefan Howorka*† † Center for Advanced Bioanalysis GmbH, 4020 Linz, Austria ‡Institute for Semiconductor and Solid State Physics, §Institute for Biophysics, Johannes Kepler University, 4040 Linz, Austria Department of Chemistry, Institute of Structural and Molecular Biology, University College London, London, England