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. 2021 Jul 15;6(9):1129–1139. doi: 10.1038/s41564-021-00934-8

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© The Author(s) 2021

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Fig. 2 — a, Stereofigure, showing a close-up of the active site in NXR-A. Active site residues (text and Supplementary Information) are shown as sticks, the FS0 and FS1 iron–sulfur clusters as ball-and-stick models. The molybdenum ion is shown as a green sphere. b, Stereofigure of the haem-binding site in NXR-C, close to the interface with NXR-B. The haem and the nearby FS4 iron–sulfur cluster are shown as sticks and a ball-and-stick model, respectively. MGD, molybdopterin guanine dinucleotide.