TY - RPRT TI - Why do plants make opioids? Testing the herbivore defense hypothesis for psychoactive alkaloids in kratom AU - McNutt, B. D. AU - Whitaker, M. R. L. PY - 2026 DO - 10.64898/2026.07.15.738691 UR - https://www.biorxiv.org/content/10.64898/2026.07.15.738691v1 ID - 10.64898/2026.07.15.738691 ER -