When the fitness interests of two individuals are different, they are in conflict.

The evolution of cooperation and conflict depends on when these kinds of behaviors are favored by natural selection.

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 Glycosphingolipids as determinants of blood groups.

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Fingolimod—a Sphingosine-1-P Mimic Is an Oral Drug for Multiple Sclerosis

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Excreted S1P provokes many different cell and tissue effects, among them inflammation in allergic reactions, cell proliferation, angiogenesis, malignant transformation, and movement and migration of certain cells.

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Sphingosine itself can be phosphorylated to produce sphingosine-1-phosphate (S1P) inside cells. 

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The amino group at C-2 bears a fatty acid in amide linkage.

The fatty acid is usually saturated or monounsaturated, with 16, 18, 22, or 24 carbon atoms.

Ceramide is the parent compound for this group.