2.1.2.1 glycine hydroxymethyltransferase folate polyglutamylation - - PWY-2161 2.1.2.1 glycine hydroxymethyltransferase folate polyglutamylation folate polyglutamylation - - 6.3.2.17 tetrahydrofolate synthase folate polyglutamylation - - PWY-2161 6.3.2.17 tetrahydrofolate synthase folate polyglutamylation folate polyglutamylation - - 6.3.4.3 formate-tetrahydrofolate ligase folate polyglutamylation - - PWY-2161 6.3.4.3 formate-tetrahydrofolate ligase folate polyglutamylation folate polyglutamylation - -