EC 1.20 Acting on phosphorus or arsenic in donors
This subclass contains enzymes that act on phosphorus or arsenic in donors. Sub-subclasses are based on the acceptor: NAD+ or NADP+ (EC 1.20.1), disulfide (EC 1.20.4), other, known, acceptors (EC 1.20.98), or some other acceptor (EC 1.20.99).