3IYF:
reference: Mechanism of folding chamber closure in a group II chaperonin., Zhang J, Baker ML, Schroder GF, Douglas NR, Reissmann S, Jakana J, Dougherty M, Fu CJ, Levitt M, Ludtke SJ, Frydman J, Chiu W, Nature. 2010 Jan 21;463(7279):379-83. PMID: 20090755

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