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3C–6C Straight-chain sugar (aldose) enantiomers. The biologically more abundant enantiomers are shown in black, and the relatively rare enantiomers are in red. In some cases, the less common enantiomer of a pair is still found in biology, e.g., both enantiomers of arabinose are shown in black. However, the l enantiomer is much more common. The d enantiomers of threose and galactose are more common than the l.
