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The structural formula of DMPC (a) and Laurdan (b). Fluorescence red shift (c) of Laurdan when partitioned between ordered (d) and disordered (e) DMPC bilayers. In (d) and (e), the Laurdan naphthalene moieties anchor at the glycerol backbone of DMPC but alignments differ. The purple double-headed arrows next to bilayer diagrams represent the possible alignments of Laurdan dipole moments. Water molecules are represented as tiny black double-headed arrows.
