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Acknowledgements
We acknowledge Gerhard Spatz-Kümbel for excellent technical assis-
tance. We thank Dr. Ye Zhou and Dr. Olle Inganꢂs for providing materi-
als and laboratory, respectively, for the PDMS stamp preparation. We are
grateful to Dr. Silke Hutschenreiter, Dr. Lutz Schmitt, Dr. Alart Mulder,
and Katrin Schulze for stimulating discussions. The work was supported
by the Deutsche Forschungsgemeinschaft (DFG) and the BMBF Nano-
biotechnology Program. Work at Linkçping University was supported by
the Swedish Foundation for Strategic Research (SSF) through the Bio-
mimetic Materials Science Program.
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