1A19:
reference: Discrepancies between the NMR and X-ray structures of uncomplexed barstar: analysis suggests that packing densities of protein structures determined by NMR are unreliable., Ratnaparkhi GS, Ramachandran S, Udgaonkar JB, Varadarajan R, Biochemistry 1998 May 12;37(19):6958-66. PMID: 9578582

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