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Purpose The objective of this work was to compare the efficacy of self-assembling cyclic and linear RGD peptide amphiphiles as carriers for delivering paclitaxel to αvβ3 integrin overexpressing tumors. Methods Linear (C18-ADA5-RGD) and cyclic (C18-ADA5-cRGDfK) peptide amphiphiles were synthesized and characterized for CMC, aggregation number and micelle stability using fluorescence spectroscopy...