Merge two exons

        :type exon_a: str
        :param exon_a: Feature UUID

        :type exon_b: str
        :param exon_b: Feature UUID

        :type organism: str
        :param organism: Organism Common Name

        :type sequence: str
        :param sequence: Sequence Name

        :rtype: dict
        :return: A standard apollo feature dictionary ({"features": [{...}]})

def merge_exons(self, exon_a, exon_b, organism=None, sequence=None):
        """
        Merge two exons

        :type exon_a: str
        :param exon_a: Feature UUID

        :type exon_b: str
        :param exon_b: Feature UUID

        :type organism: str
        :param organism: Organism Common Name

        :type sequence: str
        :param sequence: Sequence Name

        :rtype: dict
        :return: A standard apollo feature dictionary ({"features": [{...}]})
        """
        data = {
            'features': [
                {'uniquename': exon_a},
                {'uniquename': exon_b},
            ]
        }
        data = self._update_data(data, organism, sequence)
        return self.post('mergeExons', data)