Strain specific CRTAM expression analysis in homozygous B-hCRTAM mice by flow cytometry. CD8+ T cells were sorted from the splenocytes in wild-type C57BL/6 mice (+/+) and homozygous B-hCRTAM mice (H/H) and stimulated with anti-mCD3e in vitro (2 μg/mL, stimulation for 36 hours) and anti-mCD28 in vitro (5 μg/mL, stimulation for 36 hours), and analyzed by flow cytometry with species-specific anti-CRTAM antibody. Mouse CRTAM was exclusively detectable in wild-type mice. Human CRTAM was exclusively detectable in homozygous B-hCRTAM mice but not in wild-type mice.

Strain specific analysis of CRTAM mRNA expression in wild-type C57BL/6 mice and B-hCRTAM mice by RT-PCR. Spleen RNA were isolated from wildtype C57BL/6 mice (+/+) and homozygous B-hCRTAM mice (H/H), then cDNA libraries were synthesized by reverse transcription, followed by PCR with mouse or human CRTAM primers. Mouse Crtam mRNA were detectable only in wild-type C57BL/6 mice. Human CRTAM mRNA was detectable only in homozygous B-hCRTAM mice but not in wild-type mice.