PRR4 and asthma: We further used a one-to-one format for comparison and validated with the GSE63142 dataset The genes CEACAM5, PRR4, CPA3, POSTN, TCN1, CST1 (Cystatin-SN), CLCA1, TPSAB1 and NOS2 (Nitric oxide synthase 2) were highly expressed in patients with asthma (Figure 3A).