= Ceramide
A <ceramide> contains a long-chain amino alcohol carrying a <fatty acid> through an <amide> linkage; <sphingosine> is a common backbone. <Ceramides> are central building blocks of more complex <sphingolipids> and also participate in <signal transduction>.
Changing the fatty-acid chain changes packing within a <cell membrane> without changing the identity of the polar linkage. Thus the name ceramide denotes a lipid class, rather than one fixed <molecular formula>.https://www.ebi.ac.uk/chebi/CHEBI:17761[ChEBI: ceramide, definition and classification]{ref}
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