Function reference
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          amino_acid_pairs()
- Generate amino acid pairs
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          amino_acids()
- The 20 standard amino acids
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          amino_acids_properties
- Amino acid side chain property values
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          as_one_letter()
- Convert three-letter amino acid codes to one-letter codes
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          as_three_letter()
- Convert one-letter amino acid codes to three-letter codes
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          grantham_distance()
- Grantham distance
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          grantham_distances_matrix
- Grantham distance matrix
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          grantham_equation()
- Grantham distance