In the IF subcohort, we observed a weak but significant correlation between tissue IL5Rα expression and tissue eosinophil numbers in COPD and HV-ES (rho = 0.3148, p = 0.0478) and this correlation strengthened when only COPD subjects from the IF subcohort were included (rho = 0.5628, p = 0.0121, Fig. 5B). The gene discussed is IL5RA; the disease is chronic obstructive pulmonary disease.