| APN | aminopeptidase N |
| DAMGO | D-Ala2, N-Me-Phe4Gly5-ol |
| DENKIs | dual enkephalinase inhibitors |
| DOR | delta opioid receptor |
| KOR | kappa opioid receptor |
| LDN | low-dose naltrexone |
| MOR | mu opioid receptor |
| NCP | neuropathic corneal pain |
| NEP | neural endopeptidase neprylisin |
| NTX | naltrexone |
| OGF | opioid growth factor |
| OGFr | opioid growth factor receptor |
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