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Three types of α-helices: hydrophilic (blue residues), hydrophobic (green residues), and partially hydrophilic. They all share the same structure: (a) 1.5 Å per amino acid rise, (b) 100° per amino acid rotation, (c) 5.4 Å, 360°, and 3.6 amino acids per α-helical turn, despite differences in their solubility in water.
