| Dus1 | 
            tRNA-dihydrouridine(16/17) synthase [NAD(P)(+)] | 
 
            Saccharomyces cerevisiae | 
        
    
        
            | Dus2 | 
            tRNA-dihydrouridine(20) synthase [NAD(P)+] | 
 
            Saccharomyces cerevisiae | 
        
    
        
            | Dus3 | 
            tRNA-dihydrouridine(47) synthase [NAD(P)(+)] | 
 
            Saccharomyces cerevisiae | 
        
    
        
            | Dus4 | 
            tRNA-dihydrouridine(20a/20b) synthase [NAD(P)+] | 
 
            Saccharomyces cerevisiae | 
        
    
        
            | DusA | 
            tRNA dihydrouridine synthase A | 
 
            Escherichia coli | 
        
    
        
            | DusB | 
            tRNA dihydrouridine synthase B | 
 
            Escherichia coli | 
        
    
        
            | DusC | 
            tRNA dihydrouridine synthase C | 
 
            Escherichia coli |