IL9 and schizophrenia: Studies have shown that patients with schizophrenia exhibitelevated levels of monocytes, neutrophils, and C-reactive protein (CRP).Additionally, various cytokines (e.g., monocyte chemoattractant protein-1,IL-1β, IL-5, IL-6, IL-9 and TNF-α) have been reported to beupregulated in schizophrenia [32, 33, 49, 50, 51].