Source:http://linkedlifedata.com/resource/umls/id/C0007054
MSH: Enzymes that catalyze the addition of a carboxyl group to a compound (carboxylases) or the removal of a carboxyl group from a compound (decarboxylases). EC 4.1.1.,CSP: enzymes which catalyze the nonhydrolytic removal of carbon dioxide from carboxylic acids.