A sphingolipid is a lipid based on a long-chain amino alcohol, commonly sphingosine. Many sphingolipids contain a ceramide unit: a fatty-acid chain joined to the amino group by an amide bond.
Adding different polar headgroups produces distinct membrane components. A sugar headgroup gives a glycolipid, while a phosphocholine headgroup produces sphingomyelin. This modular organization connects a shared hydrophobic anchor with cell-surface recognition and signal transduction.
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