The results of nearest-neighbor recognition experiments that have been carried out with exchangeable dimers derived from 1,2-dimyristoyl-sn-glycero-3-phosphoethanolamine and 1,2-distearoyl-sn-glycero-3-phosphoethanolamine, in the presence of cholesterol, dihydrocholesterol, coprostanol, cholestane, cholesteryl methy ether, and sitosterol, provide strong support for a condensing mechanism in which the flexible acyl chains of the phospholipids complement, perfectly, the shape of neighboring sterols, thereby leading to a high number of hydrophobic contacts and tight packing.
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Cao et al. (2003) studied this question.
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