L-Arabinose has been described as a gratuitous inducer of the yeast alpha-galactosidase. This has been found to be an artefact resulting from galactose contamination of commercial samples of L-arabinose. The inactivation produced on UDP-glucose 4-epimerase by the pentose does not amplify the inducer activity of contaminating D-galactose.

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http://dx.doi.org/10.1007/BF00425800DOI Listing

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