Paul Chu Sin Chung, Helen L. Keyworth, Elena Martin-Garcia, Pauline Charbogne, Emmanuel Darcq, Alexis Bailey, Dominique Filliol, Audrey Matifas, Grégory Scherrer, Abdel-Mouttalib Ouagazzal, Claire Gaveriaux-Ruff, Katia Befort, Rafael Maldonado, Ian Kitchen, and Brigitte L. Kieffer. “A novel anxiogenic role for the delta opioid receptor expressed in GABAergic forebrain neurons.” Biological Psychiatry, 77, 4, Pp. 404–415.