The lung and intestinal samples were stored in RNAlater (Ambion, Ghent, Belgium) and RNA was extracted using the Aurum kit (Bio-Rad, Nazareth-Eke, Belgium). cDNA was synthesized using the iScript cDNA synthesis Kit (Bio-Rad) and real time qPCR was performed on the CFX384 detection system (Bio-Rad), using the SensiMix SYBR No-ROX mix (Bioline, Kampenhout, Belgium). The expression levels were normalized to the most stable housekeeping genes, which were determined for each organ using the geNorm Housekeeping Gene Selection Software within qBASE+ (Biogazelle, Zwijnaarde, Belgium) [41 (link)]. The primer sequences are listed in Table 5.
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