Figure 4 shows two representative gel images for NOS2 (130 kDa in a non-reduced form), HMOX1 (32 kDa), SOD3 (32 kDa), LPO (80 kDa), and β-actin (45 kDa) expression in the nasal mucosae of controls and CRSsNP patients via WB analysis (left panels). The quantitative densitometric analysis of all collected samples (n = 8–10) indicated significantly increased levels of both NOS2 and HMOX-1 in the CRSsNP nasal samples, with approximately 1.8- and 1.3-fold increases, respectively. This evidence concerns the gene HMOX1 and chronic rhinosinusitis without nasal polyps.