def resize_columns(worksheet, amino_acids_col, pos_col):
    """
    Resizes amino acid and mutant position columns in the Excel sheet so that they don't
    have to be expanded.
    """
    worksheet.set_column('%s:%s' % (amino_acids_col, amino_acids_col), 40)
    worksheet.set_column('%s:%s' % (pos_col, pos_col), 12)
