Figure 4. Sequence Logos for the Predicted Regulatory Sites in α-Proteobacteria.

(A) RirA-box (IRO) in eight species from the Rhizobiales order (four Rhizobiaceae, two Mesorhizobium species, Brucella, and Bartonella).

(B) Iron-Rhodo-box in the Rhodobacteraceae.

(C) Mur-box (MRS) in the Rhodobacteraceae/Rhizobiales.

(D) Fur^α-box in other α-proteobacteria species.

(E) IscR^α-I motif in the Rhodobacterales, the Rickettsia, Pelagibacter, Oceanicaulis, Caulobacter, Parvularcula, Rhodospirillum, and Magnetospirillum species.

(F) IscR^α-II motif in the Sphingomonadales and Gluconobacter species.