Oxidoreductases
Catalyzing the reaction X-H + Y-H = 'X-Y'
With other, known acceptors
The following ENZYME entries belong to class 1.21.98.-:
1.21.98.1 Cyclic dehypoxanthinyl futalosine synthase 1.21.98.2 Dichlorochromopyrrolate synthase 1.21.98.3 Anaerobic magnesium-protoporphyrin IX monomethyl ester cyclase 1.21.98.4 PqqA peptide cyclase