Strain specific analysis of IL26 mRNA expression in wild-type C57BL/6 mice and B-hIL26 mice by RT-PCR. Colon RNA were isolated from wild-type C57BL/6 mice (+/+) and homozygous B-hIL26 mice (H/H), then cDNA libraries were synthesized by reverse transcription, followed by PCR with human IL26 primers. Human IL26 mRNA was only detectable in homozygous B-hIL26 mice.