English: Structure of AcrIIA4 obtained with the UCSF Chimera software, where its PDB file was uploaded. Different colours were assigned to the four different secondary structures found in this protein: blue for β-strands, red for α-helices, orange for the 3(10) helix and grey for loops. Originally, the PDB file contains the 20 lowest energy sequences (and thus, the most stable ones) superposed, one of which was randomly selected to create the figure.
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