Figure 2: Designed peptide X-ray Crystal Structure: Four Helix Bundle

Structure at 2.5 Å of a designed peptide that maintains solubility of membrane proteins.
Schafmeister, CE; Mierkce, LJW; and Stroud, RM.  (1993)  Science 262, 734-738.
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Figure 3

Figure from "Structure at 2.5 Å of a designed peptide that maintains solubility of membrane proteins." Schafmeister, CE; Mierkce, LJW; and Stroud, RM. (1993) Science 262, 734-738.