1. Opioid‐Induced Central Immune Signaling: Implications for Opioid Analgesia
   Peter M. Grace et al, 2015, Headache: The Journal of Head and Face Pain CrossRef
2. Opioid Modulation of the Gut–Brain Axis in Opioid-Associated Comorbidities
   Li Zhang et al, 2021, Cold Spring Harbor Perspectives in Medicine CrossRef
3. Endogenous opiates and behavior: 2013
   Richard J. Bodnar, 2014, Peptides CrossRef
4. Effect of a C5a receptor antagonist on macrophage function in an intestinal transplant rat model
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5. TMT-based quantitative proteomic analysis of cumulus cells derived from vitrified porcine immature oocytes following in vitro maturation
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6. Gene Variants in Hepatic Metabolism, Gamma-Aminobutyric Acid-ergic Reward, and Prostaglandin Pathways in Opioid-Consuming and Opioid-Naïve Patients Presenting for Lower Extremity Total Joint Replacement
   Daniel W. Odell et al, 2020, Anesthesia & Analgesia CrossRef
7. Cadmium-induced immune abnormality is a key pathogenic event in human and rat models of preeclampsia
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8. Association of Pain with Plasma C5a in Patients with Neuromyelitis Optica Spectrum Disorders During Remission
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9. C5a and pain development: An old molecule, a new target
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10. The role and treatment potential of the complement pathway in chronic pain
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11. Morphine tolerance is attenuated in germfree mice and reversed by probiotics, implicating the role of gut microbiome
    Li Zhang et al, 2019, Proceedings of the National Academy of Sciences CrossRef
12. Observation of Complement Protein Gene Expression Before and After Surgery in Opioid-Consuming and Opioid-Naive Patients
    Ken B. Johnson et al, 2021, Anesthesia & Analgesia CrossRef