Asymmetric carbons are colored red.
The L-family of aldoses are the mirror images of these structures. A very nice Carbohydrate Site has been created and maintained at Leeds. The following diagram shows how glucose forms a glucopyranose structure. Since a new asymmetric center is generated in this cyclization, two new stereoisomers, termed anomers and designated a and b , are formed. The new stereocenter is termed the anomeric carbon, and is colored red in the formulas shown here.