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Figure 13 The polypeptide backbones of (a) bovine carboxypeptidase A (pdb file 2ctb) and (b) chicken triose phosphate isomerase (pdb file 1tim). Strands of the β sheets are represented as ribbon arrows, pointing in the direction of the C-terminus, and α helices are shown as cylinders. Note the pronounced right-handed twist of the β sheets in these two enzyme structures. Note also the location of the β sheet structures at the core of the proteins.

 1.3.2 β pleated sheets