Strain specific CD23 expression analysis in homozygous B-hCD23 mice by flow cytometry. Spleen and lymph node were collected from wild-type C57BL/6 mice (+/+) and homozygous B-hCD23 mice(H/H), and analyzed by flow cytometry with species-specific anti-CD23 antibody. Mouse CD23 was detectable in wild-type mice. Human CD23 was exclusively detectable in homozygous B-hCD23 mice but not in wild-type mice.