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Fatty acid-based vesicles as protocells. Fatty acid vesicles containing a dipeptide catalyst seryl-histidine (Ser-His), which catalyzes the formation of a second dipeptide, N-Acetyl-L-phenylalanine-leucinamide (AcPheLeuNH2). The newly-formed hydrophopic dipeptide localizes to the vesicle membranes, imparting enhanced affinity for fatty acids, thus promoting vesicle growth.
