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Example of computing feature 1 (F1) of amino acid repeats. F1 is the sum of squared length of single amino acid repeats (SARs) in the whole protein sequence. In this example, F1 (repeats of S) = 12 + 32 + 32 = 19, F1 (repeats of W) = 42 + 22 = 20, and F1 (repeats of R) = 12 + 62 = 37.
