Figure 6From: A solute-binding protein for iron transport in Streptococcus iniaeDetection of the heme-binding activity of purified MtsA by the pyridine hemochrome assay. (A) UV-visible absorption spectrum of 20 μM purified MtsA (■line) in 50 mM Tris-HCl (pH 8.0). (B) UV-visible absorption spectrum of 20 μM purified KatG (Δ line) in 50 mM Tris-HCl (pH 8.0).Back to article page