4H6Q:
reference: Crystal Structures and Kinetics of Monofunctional Proline Dehydrogenase Provide Insight into Substrate Recognition and Conformational Changes Associated With Flavin Reduction and Product Release., Luo M, Arentson BW, Srivastava D, Becker DF, Tanner JJ, Biochemistry. 2012 Nov 14. PMID: 23151026

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