EC 4.1 Carbon-carbon lyases

This subclass contains the decarboxylases (carboxy-lyases; EC 4.1.1), the aldehyde-lyases, which catalyse the reversal of an aldol condensation (EC 4.1.2), the oxo-acid-lyases, which catalyse the cleavage of a 3-hydroxy acid (EC 4.1.3) and other carbon-carbon lyases (EC 4.1.99), or the reverse reactions.