Figure 2From: Microbial iron management mechanisms in extremely acidic environments: comparative genomics evidence for diversity and versatilityAbundance and diversity of predicted ferric iron siderophore transporters in Acidithiobacilli and Leptospirilla. The Ven diagram shows species-specific and shared TonB dependent outer membrane receptors. Color coding indicates predicted siderophore specificity. Red: dicitrate, Green: linear catecholate, Blue: cyclic catecholate, Purple: hydroxamate.Back to article page