FIGURE 4.

Effect of cobalamin on CcP activity. The activity was followed spectrophotometrically at 550 nm as indicated under Section “Materials and Methods.” Data represent the average of two independent experiments (lines on top of bars indicate value ranges). One unit (U) is defined as the amount of enzyme required to oxidize 1 μmol of ferrocytochrome c per min. ^∗P < 0.05, ^∗∗P < 0.01.