Figure 3

Haem-stained proteins of membranes prepared from E. meliloti 1021 (WT) and the norC and napC mutants incubated in MM or MMN for 24 h under 2% initial O ₂ or anoxic conditions. Each lane contains 25 μg of membrane proteins. Haem-stained c-type cytochromes identified previously (FixP and FixO) and in this work (NorC) are specified in the right margin. Apparent protein molecular masses (kDa) are shown in the left margin.