def get_ensembl_protein_id_from_mapping(data):
    """
    Gets a list of Ensembl IDs from a 'xrefs/symbol/' mapping.

    :param data: Requests object from the Ensembl-UniProt Mapping
    :return: list of Ensembl Protein IDs
    """
    ensps = []
    for entry in data:
        if 'type' in entry and 'id' in entry:
            if entry['type'] == 'translation':
                if entry['id'] not in ensps:
                    ensps.append(entry['id'])
    return ensps
