Northern blots (NB) loaded with equal amounts of RNA from each of the piglets were hybridized with P 32 -labeled cDNA probes homologous to six differentially expressed mRNAs and to three mRNAs that were not identified as differentially expressed. For all nine mRNAs, the length of the transcript(s) detected on blots were comparable to the length of porcine or human mRNA reference sequences posted in the NCBI databank or reported in the literature.