Nociceptin/Orphanin FQ Inhibits the Survival and Axon Growth of Midbrain Dopaminergic Neurons Through a p38-MAPK Dependent Mechanism. Alzforum, 26 Dec 2015 Collins LM, Dal Bo G, Calcagno M, Monzón-Sandoval J, Sullivan AM, Gutierrez H, Morari M, O'Keeffe GW.