Fig. 4. Co-occurrence of rhodanese modules in association with other protein domains. Domains are schematized as colored boxes. Catalytic rhodanese modules with a six-amino-acid active-site loop are shown in red, and inactive rhodanese modules are displayed in black. Rhodanese modules with a seven-amino-acid active-site loop are displayed in yellow. Other protein domains are shown in gray. Active-site loop positions displaying at least 80% amino-acids conservation within each subfamily are also shown as conserved motifs.