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Fig. 2. Persistence of testosterone in three different soils. [¹⁴C]-Testosterone at an initial concentration of 1 mg/kg soil was mineralized to ¹⁴CO₂ (top panel), total ¹⁴C residues in soil extracts were determined by liquid scintillation counting (LSC) (middle panel), and loss of androgenic activity in soil extracts was measured using a human androgen receptor recombinant yeast strain (bottom panel). Note the different time scale in the top panel.