Keratan sulfate, chemical structure

In all, eight glycosaminoglycans of essentially diflFerent chemical structures have been identified. Through the times, these glycosaminoglycans have been individually named in a number of ways, as shown in Table 1. Most of these names are used currently, and so the reader will find it useful to have this table available when consulting the primary literature. Where the term chondroitin sulfate appears in the more recent literature, this can mean chondroitin 4-sulfate or chondroitin 6-sulfate or a mixture of the two. The terms keratan sulfate I and keratan sulfate II are sometimes used to denote keratan sulfates of comeal and skeletal origin, respectively, there being some differences between the two. 

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