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The introduced RRE(9-11) variations were designed to abolish or stabilize the structure of the α-helix and, consequently, to increase or decrease protein activity compared to the wild type. The terminal structure of the peptides was established using circular dichroism (CD), 2D nuclear magnetic resonance (NMR), and molecular dynamics (MD) in membrane-mimetic or membrane-model environments. Our structural results show that in the RRE(9-11)AAA and E11G peptides the helical structure has been stabilized, whereas for the RRE(9-11)GGG pepti