5AUQ:
reference: Structural basis of a Ni acquisition cycle for [NiFe] hydrogenase by Ni-metallochaperone HypA and its enhancer., Watanabe S, Kawashima T, Nishitani Y, Kanai T, Wada T, Inaba K, Atomi H, Imanaka T, Miki K, Proc Natl Acad Sci U S A. 2015 Jun 8. pii: 201503102. PMID: 26056269

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