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Possible pathways of pentose metabolism. d-Lyxose can be isomerized to d-xylulose, an intermediate in the pentose phosphate pathway. l-Ribose can be converted to l-ribulose or reduced to ribitol (4), and l-lyxose can be used by the l-rhamnose pathway found in certain E. coli mutants (42). Glycolytic intermediates which can be connected to the pentose phosphate pathway are enclosed in a box.
