This finding was further validated by the expression of CD69 and CX3CR1 in cluster 13, accounting for a total of 31% of the cells present in the pericardial fluid of myocarditis patients, compared to 1.08% and 0% of cells present in the PBMCs of matched myocarditis or no irAE patients, respectively (Supp. The gene discussed is CX3CR1; the disease is myocarditis.