TY - RPRT TI - Advanced age attenuates the antihyperalgesic effect of morphine and decreases μ-opioid receptor expression and binding in the rat midbrain Periaqueductal Gray in male and female rats AU - Fullerton, E. F. AU - Rubaharan, M. AU - Karom, M. C. AU - Hanberry, R. L. AU - Murphy, A. Z. PY - 2020 DO - 10.1101/2020.06.16.154740 UR - https://www.biorxiv.org/content/10.1101/2020.06.16.154740v1 ID - 10.1101/2020.06.16.154740 ER -