def get_gff3(self, feature_id, organism=None, sequence=None):
        """
        Get the GFF3 associated with a feature

        :type feature_id: str
        :param feature_id: Feature UUID

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

        :type sequence: str
        :param sequence: Sequence Name

        :rtype: str
        :return: GFF3 text content
        """
        data = {
            'features': [
                {
                    'uniquename': feature_id
                }
            ]
        }
        data = self._update_data(data, organism, sequence)
        return self.post('getGff3', data, is_json=False)