9:00 AM. 392. A Hyaluronic Acid Hydrogel Multi-spheroid Midbrain Model for Studying Opioid Addiction.Ze Zhong Wang, Ph.D1, Zhan Shu, Ph.D2, Alexander Laperle, Ph.D3, Samantha Santacruz, Ph.D1, Clive Svendsen, Ph.D3, Nigel Maidment, Ph.D2, Stephanie Seidlits, PhD4 1University of Texas Austin, 2University of California, Los Angeles, 3Cedars-Sinai Medical Center, 4University of Texas at Austin