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The structure and nomenclature of ceramides. (a) A ceramide is composed of a sphingoid base (SB) and a fatty acid (FA). (b,c) FAs (b) and SBs (c) in the major ceramide classes in human epidermis. (d) The different classes of ceramides are designated by a combination of the abbreviations of FAs and SBs. The numbers indicate their former numerical nomenclature.
