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== Externe links ==
* [https://web.archive.org/web/20100609203913/http://www.cyberlipid.org/sterols/ster0003.htm Sterols] Cyberlipid.org
* {{cite book |author=Alberts, Bruce |title=Molecular biology of the cell |publisher=Garland Science |location=New York |year=2002 |page=1874 |volume=IV. Internal Organization of the Cell |chapter=10. Membrane Structure |isbn=0-8153-4072-9 |url=http://www.ncbi.nlm.nih.gov/books/bv.fcgi?highlight=cholesterol,bilayer&rid=mboc4.section.1864#1874 |quote=The Fluidity of a Lipid Bilayer Depends on Its Composition |format=Online at NIH}}