4KF5:
reference: Split green fluorescent protein as a modular binding partner for protein crystallization., Nguyen HB, Hung LW, Yeates TO, Terwilliger TC, Waldo GS, Acta Crystallogr D Biol Crystallogr. 2013 Dec;69(Pt 12):2513-23. doi:, 10.1107/S0907444913024608. Epub 2013 Nov 19. PMID: 24311592

This OCA Structure page
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