![43. Modulating β-Arrestin-2 Recruitment at the δ- and μ-Opioid Receptors](https://images.squarespace-cdn.com/content/v1/615f42729a3e7155f1428c2e/3446b4e6-af52-4626-a982-66bd3829ce8b/43+TAR.png)
43. Modulating β-Arrestin-2 Recruitment at the δ- and μ-Opioid Receptors
Sharma K. S.; Cassell, R. J.; Meqbil, Y. J.; Su, H.; Blaine, A. T.; Cummins, B. R.; Mores, K. L.; Johnson, D.; van Rijn, R. M.;* Altman, R. A.*
![34. The Meta-Position of Phe4 in Leu-enkephalin Regulates Potency, Selectivity, Functional Activity, and Signaling Bias at the Delta and Mu Opioid Receptors](https://images.squarespace-cdn.com/content/v1/615f42729a3e7155f1428c2e/8418ae18-816e-44a1-8cdb-4a7b1937894b/34+TAR.png)
34. The Meta-Position of Phe4 in Leu-enkephalin Regulates Potency, Selectivity, Functional Activity, and Signaling Bias at the Delta and Mu Opioid Receptors
Cassell, R. J.; Sharma K. S.; Su, H.; Cummins, B. R.; Cui, H.; Mores, K. L.; Blaine, A. T.; Altman, R. A.;* van Rijn, R. M.*
![28. Tyr1-ψ[(Z)CF═CH]-Gly2 Fluorinated Peptidomimetic Improves Distribution and Metabolism Properties of Leu-Enkephalin](https://images.squarespace-cdn.com/content/v1/615f42729a3e7155f1428c2e/b38e44d8-f805-4435-9027-405fb482a0d0/28+TAR.png)
28. Tyr1-ψ[(Z)CF═CH]-Gly2 Fluorinated Peptidomimetic Improves Distribution and Metabolism Properties of Leu-Enkephalin
Altman, R. A.;* Sharma, K. K.; Rajewski, L. G.; Toren, P. C.; Baltezor, M. J.; Pal, M.; Karad, S. N.
![24. Synthesis and Opioid Activity of Tyr1–ψ[(Z)CF=CH]–Gly2 and Tyr1–ψ[(S)/(R)-CF3CH–NH]–Gly2 Leu-enkephalin Fluorinated Peptidomimetics](https://images.squarespace-cdn.com/content/v1/615f42729a3e7155f1428c2e/21ac3367-d851-433c-bd0a-e2996127a426/24+TAR.png)
24. Synthesis and Opioid Activity of Tyr1–ψ[(Z)CF=CH]–Gly2 and Tyr1–ψ[(S)/(R)-CF3CH–NH]–Gly2 Leu-enkephalin Fluorinated Peptidomimetics
Karad, S. N.; Pal, M.; Crowley, R. S.; Prisinzano, T. E.; Altman, R. A.*