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Total RNA was extracted from the nasal UTs and NP tissues. The expression of 15-LOX-1 mRNA was analyzed by RT-PCR. The expression levels of mRNA were normalized to those of the glyceraldehyde 3-phosphate dehydrogenase housekeeping gene (GAPDH). * p < 0.05, ** p < 0.01, *** p < 0.001, and **** p < 0.0001. (●: control UTs; ■: UTs from CRS subjects; ▲: NP tissues from non-ECRS subjects; ▼: NP tissues from ECRS subjects).
