2D01:
reference: The Crystal Structure of the R52Q Mutant Demonstrates a Role for R52 in Chromophore pK(a) Regulation in Photoactive Yellow Protein(,)., Shimizu N, Kamikubo H, Yamazaki Y, Imamoto Y, Kataoka M, Biochemistry. 2006 Mar 21;45(11):3542-7. PMID: 16533035

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