3ADF:
reference: The structure of mAG, a monomeric mutant of the green fluorescent protein Azami-Green, reveals the structural basis of its stable green emission., Ebisawa T, Yamamura A, Kameda Y, Hayakawa K, Nagata K, Tanokura M, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2010 May 1;66(Pt, 5):485-9. Epub 2010 Apr 29. PMID: 20445241

This OCA Structure page
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