4U99:
reference: Structural insights into the role of iron-histidine bond cleavage in nitric oxide-induced activation of H-NOX gas sensor proteins., Herzik MA Jr, Jonnalagadda R, Kuriyan J, Marletta MA, Proc Natl Acad Sci U S A. 2014 Sep 24. pii: 201416936. PMID: 25253889

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