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Amino acid substitution matrices, such as PAM (Point Accepted Mutation) and BLOSUM (Blocks Substitution Matrix), are essential tools in bioinformatics for comparing and aligning biological sequences, particularly protein sequences. These matrices represent the likelihood of one amino acid being substituted for another in a sequence over evolutionary time, offering valuable insight into sequence similarity and evolutionary relationships. The structure of amino acid substitution matrices involves assigning numerical values to amino acid pairwise substitutions, indicating how likely one amino acid is to be replaced by another. The values are typically based on observed or predicted mutations in protein sequences across species. Each matrix assigns a score ____ ______ ______ ________ ____ _________ ___ ____.
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