6.3.2.17 tetrahydrofolate synthase; folylpolyglutamate synthase; folate polyglutamate synthetase; formyltetrahydropteroyldiglutamate synthetase; N10-formyltetrahydropteroyldiglutamate synthetase; folylpoly-gamma-glutamate synthase; folylpolyglutamyl syntheta • • •