“…Both peptides were applied as biorecognition units to validate a colorimetric metal ion detection technique using AuNPs [22–23] . In our recent study, we generated genetically modified fd virus constructs displaying N‐terminal cropped versions (H, HG, HGF, HGFA, HGFAN, HGFANV and HGFANVA) of Cu5 peptide where we reported on the significant role of H unit on Cu(II) binding affinities [24] . In this study, we generated recombinant viruses displaying C‐terminal truncated variants (A, VA, NVA, ANVA, FANVA, GFANVA) of Cu5 peptide excluding the H unit.…”