TY - RPRT TI - Intermittent self-administration of fentanyl induces a multifaceted addiction state associated with persistent changes in the orexin system. AU - Fragale, J. E. AU - James, M. H. AU - Aston-Jones, G. PY - 2020 DO - 10.1101/2020.04.23.055848 UR - https://www.biorxiv.org/content/10.1101/2020.04.23.055848v1 ID - 10.1101/2020.04.23.055848 ER -