Peroxidases can be haem and non haem containing proteins.

According to the phylogenetic trees, 13 major groups, which are subdivided in more than 60 classes, are present in the database.

Other oxido-reductases contain 10 major groups, subdivised in more than 35 classes.

The Description of each major group including the different classes, the know profiles and patterns, general description and corresponding literature can be found here.