Among the thirteen proteins with high immunogenicity with AD serum samples, four proteins, anthrax toxin receptor 1 (ANTXR1), nuclear protein 1 (NUPR1), glycogen phosphorylase (PYGB), and olfactory receptor 8J1 (OR8J1), were identified and showed abilities to distinguish AD patients from the healthy people using a fine-tuned luminescence beads immunoassay, thus being added to the blood-based criteria for AD biomarkers (Figure 10D). The gene discussed is OR8J1; the disease is Alzheimer disease.