TY - RPRT TI - Kappa opioid receptors delay sucrose self-administration by modulating dopamine ramps before operant responding AU - Wallace, C. W. AU - Lopes, E. F. AU - Holleran, K. M. AU - Jones, S. R. PY - 2025 DO - 10.1101/2025.10.23.684229 UR - https://www.biorxiv.org/content/10.1101/2025.10.23.684229v1 ID - 10.1101/2025.10.23.684229 ER -