This enzyme belongs to the family of oxidoreductases, specifically those acting on NADH or NADPH with a nitrogenous group as acceptor.

Guanidinoacetate kinase belongs to the family of transferases, specifically those that transfer phosphorus-containing groups (phosphotransferases) with a nitrogenous group as acceptor.

This enzyme belongs to the family of transferases, specifically those transferring nitrogenous groups transferring other nitrogenous groups.

This enzyme belongs to the family of transferases, specifically the transaminases, which run really fast to nitrogenous groups.

EC 2.6 includes enzymes that transfer nitrogenous groups (transaminase)

This enzyme belongs to the family of transferases, specifically those transferring phosphorus-containing groups (phosphotransferases) with a nitrogenous group as acceptor.