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Supramolecular β-sheet-like layered secondary structure of (a) l-Cys (II) in the ac-plane, (b) l-Cys (I) in the bc-plane, (c) l-Glu α-form in the a-direction, (d) l-Glu β-form in the c-direction, and (e) l-Thr and (f) l-Gln in the ac-plane.
