4L55:
reference: Investigating the ruthenium metalation of proteins: X-ray structure and Raman microspectroscopy of the complex between RNase A and AziRu., Vergara A, Russo Krauss I, Montesarchio D, Paduano L, Merlino A, Inorg Chem. 2013 Oct 7;52(19):10714-6. doi: 10.1021/ic401494v. Epub 2013 Sep 16. PMID: 24093479

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