4XTT:
reference: Structural Studies of Potassium Transport Protein KtrA Regulator of Conductance of K+ (RCK) C domain in Complex with Cyclic Diadenosine Monophosphate (c-di-AMP)., Kim H, Youn SJ, Kim SO, Ko J, Lee JO, Choi BS, J Biol Chem. 2015 May 7. pii: jbc.M115.641340. PMID: 25957408

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