2Z6X:
reference: Light-dependent regulation of structural flexibility in a photochromic fluorescent protein., Mizuno H, Mal TK, Walchli M, Kikuchi A, Fukano T, Ando R, Jeyakanthan J, Taka J, Shiro Y, Ikura M, Miyawaki A, Proc Natl Acad Sci U S A. 2008 Jul 8;105(27):9227-32. Epub 2008 Jun 23. PMID: 18574155

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