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
   Chiyoshi Toyama et al, 2022, Transplant Immunology CrossRef
5. TMT-based quantitative proteomic analysis of cumulus cells derived from vitrified porcine immature oocytes following in vitro maturation
   Bao-Yu Jia et al, 2020, Theriogenology CrossRef
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
   Yanping Tong et al, 2022, Neuropsychiatric Disease and Treatment CrossRef
9. C5a and pain development: An old molecule, a new target
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10. Morphine tolerance is attenuated in germfree mice and reversed by probiotics, implicating the role of gut microbiome
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11. 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