Let us look at a model of a phosphoglyceride, such as phosphatidyl choline. Its overall shape is roughly rectangular ( Figure ). The two hydrophobic fatty acid chains are approximately parallel to each other, whereas the hydrophilic phosphoryl choline moiety points in the opposite direction. Sphingomyelin has a similar conformation, as does the archaeal lipid depicted. Therefore, the following shorthand has been adopted to represent these membrane lipids: the hydrophilic unit, also called the polar head group , is represented by a circle, whereas the hydrocarbon tails are depicted by straight or wavy lines ( Figure ).
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