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Of these, only three occur in nature: D-glucose, D-galactose, and D-mannose.
Of these D isomers all, except altrose, are naturally occurring. No L isomers are found naturally.
I found this two sentences in the article, in the same Aldohexoses section. What does that mean, could somebody explain a bit further please?Fufu Fang 21:36, 2 March 2007 (UTC)