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. 2015 Jan 16;6:6010. doi: 10.1038/ncomms7010

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In a, the WGOFET device schematic structure is shown. The source (S) and drain (D) interdigitated contacts are defined on a flexible foil. The S–D patterned substrate is covered by the p-type, PBTTT-C14 and a 3 μl droplet of water lies on the OSC surface. A bio-functionalized Au-plate hangs in contact with the water droplet, acting as gate (G). The pOBP protein structure is sketched in b along with the SAM on the gate surface. pOBP is a monomer of 157 amino acid residues (molecular mass of ~19 kDa) with a height of 38.04 Å and a base of 25.70 × 26.40 Å.