Fig. 1. Schematic strategy for obtaining nanostructured protein films. (A) PDMS stamp over a microscope slide covered with a plastic film in order to facilitate the stamp removal. (B) A solution of concentrated protein with PEG is deposited over the PDMS stamp and dried at room temperature. (C) Once the protein film is formed, a drop of 10% liquid PMMA is deposited over the film and dried at 70 °C. (D) When dried, the PMMA-protein film could be easily peeled off from the PDMS stamp. (E) As proteins display good adhesion properties, a glass support can be used instead of PMMA, and in this case the protein film is directly transferred to the surface of the glass. As an example, a protein film has been stamped on a glass bottle.