TY - RPRT TI - Contextual control of conditioned pain tolerance and endogenous analgesic systems: Evidence for sex-based differences in endogenous opioid engagement AU - Trask, S. AU - Mogil, J. S. AU - Helmstetter, F. AU - Stucky, C. L. AU - Sadler, K. E. PY - 2021 DO - 10.1101/2021.12.02.470965 UR - https://www.biorxiv.org/content/10.1101/2021.12.02.470965v1 ID - 10.1101/2021.12.02.470965 ER -