def attributes_dict_to_string(attributes_dict):
    """
    Converts an attributes dict back into GTF string format.

    Args:
        attributes_dict: a dict mapping attribute keywords to their
            values

    Returns:
        a string of the given attributes in GTF format

    >>> attributes_dict_to_string({
    ...     'gene_name': 'ESR1',
    ...     'gene_biotype': 'protein_coding',
    ... })
    'gene_name "ESR1"; gene_biotype "protein_coding";'
    """
    output_strings = []
    for key, value in attributes_dict.items():
        output_strings.append('{} "{}";'.format(key, value))
    return ' '.join(output_strings)