title: Comparative neurobiology of opioids in invertebrates with special attention to senescent alterations.
mesh_terms: D000818:Animals; D004723:Endorphins / Q000378:metabolism*; D007448:Invertebrates / Q000378:metabolism*; D009474:Neurons / Q000378:metabolism; D011957:Receptors, Opioid / Q000378:metabolism; D013997:Time Factors
chemical_list: D004723:Endorphins; D011957:Receptors, Opioid