The thu cluster. thuA, glucose-6-phosphate 1-dehydrogenase gene; thuB, racemase gene; thuC, PEP-protein phosphotransferase gene; thuD, UDP-glucose-6-dehydrogenase gene; thuE, shikimate kinase gene; thuF, glycosyltransferase gene; thuG, N-acyl-d-glucosamine 2-epimerase gene; thu1, putative exopolysaccharide polymerization protein gene; thu2, non-ribosomal peptide synthetase gene; thu3, bacterial gene of unknown function; thu4, SAM-dependent methyltransferase.