Monoamine oxidases catalyze the oxidative deamination of monoamines. Other enzymes capable of producing superoxide are xanthine oxidase, NADPH oxidases and cytochromes P450. Such enzymes include esterases, glutathione transferases, and mixed microsomal oxidases. Tyrosinases and catechol oxidases are collectively termed polyphenol oxidases. Amino acid oxidases and proteases are used for digestion. Class I oxidases are cytochrome oxidases and use oxygen as the terminal electron acceptor. A distinct family of cytochromes, the cytochrome P450 oxidases, are involved in steroidogenesis and detoxification. Dieldrin can then be directly oxidized by cytochrome oxidases, which forms 9-hydroxydieldrin. The oxidases are a subclass of the oxidoreductases. Tyramine is physiologically metabolized by monoamine oxidases (primarily MAO-A), FMO3, PNMT, DBH, and CYP2D6. Type I enzymes such as mixed function oxidases. Hydrogen peroxide is produced by a wide variety of enzymes including several oxidases. In contrast to eukaryotes the respiratory chain of prokaryotes is branched to multiple terminal oxidases. Class II oxidases are Quinol oxidases and can use a variety of terminal electron acceptors. Biotransformation of aldrin starts with epoxidation of aldrin by mixed-function oxidases (CYP-450), which forms dieldrin.