def crispr_tag_1(testapp, lab, award, ctcf):
    item = {
        'lab': lab['@id'],
        'award': award['@id'],
        'category': 'insertion',
        'purpose': 'tagging',
        'method': 'CRISPR',
        'modified_site_by_gene_id': ctcf['@id'],
        'introduced_tags': [{'name': 'mAID-mClover', 'location': 'C-terminal'}]
    }
    return testapp.post_json('/genetic_modification', item).json['@graph'][0]