Figure 1. ICP-MS analysis of amount of Fe. (A) Fe binding of GST or GST-CPN20. Five μg GST or GST-CPN20 incubated with 2 μM ferrous ammonium sulfate was tested. (B) Fe binding of Holo-FSD1 on incubation with GST or GST-CPN20. Five μg Holo-FSD1 incubated with 5 μg GST or GST-CPN20 in 2 μM ferrous ammonium sulfate solution was tested. Data are relative to the GST control (mean ± SD, n = 5). *, p < 0.05 (two-tailed Student’s t-test).