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Kristopher Kieft (University of Wisconsin–Madison) and colleagues published a research article in Nature Communications on the ecology of inorganic sulfur auxiliary metabolism in widespread phages. They identified 191 phages encoding 227 auxiliary metabolic genes (AMGs) for the oxidation of sulfur and thiosulfate. Profiling of AMGs suggested significant contributions by phages to sulfur and thiosulfate oxidation. The study provides fundamental insights into the distribution, diversity, and ecology of phage auxiliary metabolism associated with sulfur.