Figure 4. Fluorescence Microscopy of stainless steel wires. (A) uncontaminated, (B–E) incubated with 10% hamster brain homogenate infected with the 263K prion strain and treated with 224 μg mL⁻¹ Fe³⁺, 500 μg mL⁻¹ h⁻¹ H₂O₂, pH = 3.5 and UV-A for 0, 240, 360, and 480 min respectively. Each row of panels (1–2) demonstrates areas of wires of the same group. Bar: 200 μm