5B6L:
reference: Crystal structure of the zinc-bound HhoA protease from Synechocystis sp. PCC 6803., Dong W, Wang J, Niu G, Zhao S, Liu L, FEBS Lett. 2016 Oct;590(19):3435-3442. doi: 10.1002/1873-3468.12416. Epub 2016, Sep 23. PMID: 27616292

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