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Mercury L3‐edge HR‐XANES spectra of metallothionein (MT) and Mytilus edulis tissues (ME). Two Hg species (represented in inset) are identified by HR‐XANES and structure modeling, (1) a two‐coordinate thiolate complex with secondary Hg⋅⋅⋅ O interactions from carbonyl oxygen donors, and (2) a tetrahedrally coordinated Hg‐thiolate cluster [Hgx(Cys)y].
