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peptide sequences to silk genes and chemical conjugation of functional molecules onto amino acid side chains are the only two methods currently known to achieve a functionalized 4RepCT protein with tunable functionality. The first approach has the advantage that post-translational manipulation of the silk is minimized. Unfortunately, genetic manipulation is challenging due to the high GC (guanine-cytosine) content of the gene which leads to transcription errors. This method also limits the prevalence of functional binding sites to a single ligand-binding

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