In Fig. 2c,d, both HCFC1R1 and STK11 showed more retained introns after infection, as RT-PCR using primers specifically amplifying the introns in question detected an increase in amount of fragment size of 358 bp and 742 bp for these two genes, respectively, confirming the increase of unspliced intron (arrows in Fig. 2c,d). Here, HCFC1R1 is linked to infection.