Observed concentration (ppb) of Hg in newly fertilized zebrafish embryos (24 hpf) after co-exposure to either 0.03 (•---•) or 0.10 (■---■) µM MeHg and either 0.03, 0.05, 0.10, or 0.30 µM SeMet. Predicted concentration (ppb) of Hg in newly fertilized zebrafish embryos (24 hpf) after co-exposure to either 0.03 (♦---♦) or 0.10 (▲---▲) µM MeHg and either 0.03, 0.05, 0.10, or 0.30 µM SeMet. Linear regression model for each concentration of MeHg vs. SeMet displayed.