4J9J:
reference: Establishing catalytic activity on an artificial (betaalpha)-barrel protein designed from identical half-barrels., Sperl JM, Rohweder B, Rajendran C, Sterner R, FEBS Lett. 2013 Jun 24. pii: S0014-5793(13)00469-9. doi:, 10.1016/j.febslet.2013.06.022. PMID: 23806364

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