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In a protein, certain domains may form specific structures such as a helix and bstrand, which constitute the secondary structure of the protein.
Figure 2-C-1. The secondary structure of RNase A, which contains three a helices and seven b strands.
(a)
Figure 2-C-2. The a helix and b strand in RNase A. (a) Residues 1 to 36. (b) Residues 80 to 85. PDB ID = 1RCN.
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