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Inspecting mutations in a specific region for each month. (A) Mutation frequencies of three genomic regions in the N gene (PCR primers US-CDC-N1 to N3). (B–D) CalmBelt reports the number of cases for each amino acid change (missense mutation) according to user input. (D) Number of cases harboring co-occurrence amino acid changes (L452R and P681R in S gene).
