a common functional variant - Asn40Asp - was indeed discovered in the Opioid Receptor Mu 1 (OPRM1) gene, which encodes the mu-opioid receptors, the target for naltrexone
This passage references ‘Asp’ solely as a biochemical amino-acid substitution designation (Asn40Asp) in pharmacogenetic research on naltrexone response, entirely unrelated to the symbolic or psychological meanings of the asp.
, Perspectives on the pharmacological management of alcohol use disorder: Are the approved medications effective?, 2022aside