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Hg/Se ratio (average ± SE) plotted against nematode growth difference (average % of control ± SE) from expected growth under additive conditions for selenium–mercury coexposures at the highest selenium exposure. Faceted plots represent exposure to (A) selenate (50 mM), (B) selenite (1500 µM), or (C) selenomethionine (500 µM). HgCl2 and MeHg exposures are indicated by open and closed circles, respectively. Red dashed line indicates a 1:1 Hg/Se ratio.
