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a phospholipid containing serine that is an important constituent of cell membranes and is localized preferentially in the inner surface of the plasma membrane. Abbreviated PS.

phos·pha·ti·dyl·ser·ine (PtdSer),

The condensation product of phosphatidic acid and serine; found in biomembranes.
See also: cephalin.

phosphatidylserine (fäsˑ·f·tīˈ·dl·s·rēn),

n a phospholipid that has been used to treat cognitive impairment, depression, and the symptoms of overexertion. Caution is advised for patients taking heparin. Also called


one of the lipids concerned in the structure of cell membranes.
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