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Position-dependent amino acid compositional biases for selected helix sizes. A: Helix length is 10 amino acid residues; (B) helix length – 15 residues; (C) helix length – 20 residues. Major groups of amino acids obtained in the clustering are bold-marked: Alanine; aromatic (A); charged (C); hydrophobic (H); polar (P); and non- α.
