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2. Functional Significance of Neurotransmitter Systems
   Kostas N. Fountoulakis, 2022, The Human Connectome CrossRef
3. Multiple Sclerosis and the Endogenous Opioid System
   Zoë Dworsky-Fried et al, 2021, Frontiers in Neuroscience CrossRef
4. Functional Characterization and Molecular Marker Development of the Proenkephalin as Biomarker of Food Addiction in Food Habit Domestication of Mandarin Fish (Siniperca chuatsi)
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5. Avian opioid peptides: evolutionary considerations, functional roles and a challenge to address critical questions
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6. IL18 signaling promotes homing of mature Tregs into the thymus
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