5MA4:
reference: Design and applications of a clamp for Green Fluorescent Protein with picomolar affinity., Hansen S, Stuber JC, Ernst P, Koch A, Bojar D, Batyuk A, Pluckthun A, Sci Rep. 2017 Nov 24;7(1):16292. doi: 10.1038/s41598-017-15711-z. PMID: 29176615

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