angle in barrel

PROTEIN FOLDS IN THE ALL-B AND ALL-A CLASSES
Annu. Rev. Biophys. Biomol. Struct. 1997. 26:597–627
P.611 Figure 7

THE CLASSIFICATION AND ORIGINS OF PROTEIN FOLDING PATTERNS
Annu. Rev. Biochem. 1990. 59:1007-39
P.19 Figure B