Oxidoreductases
Catalyzing the reaction X-H + Y-H = 'X-Y'
With other acceptors
The following ENZYME entries belong to class 1.21.99.-:
1.21.99.1 Beta-cyclopiazonate dehydrogenase 1.21.99.2 Transferred entry: 1.21.98.1 1.21.99.3 Thyroxine 5-deiodinase 1.21.99.4 Thyroxine 5'-deiodinase 1.21.99.5 Tetrachloroethene reductive dehalogenase