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(A) The structural features of the Aβ3K. The carbon atoms of the R-hydrazino turn are displayed in green and the two β-turn carbon atoms involving the residue 2-5 and 5-8, surrounding this N-N turn, are respectively shown in cyan and in magenta, side chains have been removed for clarity. Hydrogen bonds are represented with dashed lines. (B) Distances and torsion angles in the hydrazino turn.
