Structure Activity Relationship for Autonomic. Atropine (DB00572) The Pharmacogenomics Journal - Abstract of article: Clinical response to morphine in cancer patients and genetic variation in candidate genes. Search results : mu opioid receptor : Nature. Search. Search Results. Loss of morphine-induced analgesia, reward effect and... [Nature. 1996. Human mu opiate receptor. cDNA and genomic clones,... [FEBS Lett. 1994. The polymorphism A118G of the human mu-opio... [Pharmacogenetics. 2002.