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(a) Self-assembly of symmetric amphiphilic dumbbells in aqueous solution: helical nanofibers without guest molecules or vesicles after addition of guest molecules [34]; (b) Temperature-induced reversible closing of pores in a vesicle membrane [40]. Copyright Wiley-VCH, adapted from Angewandte Chemie International Edition 2006 [34] and reprinted from Angewandte Chemie International Edition 2008 [40].
