3RUS:
reference: Mechanism of nucleotide sensing in group II chaperonins., Pereira JH, Ralston CY, Douglas NR, Kumar R, Lopez T, McAndrew RP, Knee KM, King JA, Frydman J, Adams PD, EMBO J. 2011 Dec 23. doi: 10.1038/emboj.2011.468. PMID: 22193720

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