CD44 is widely expressed on hematopoietic and non-hematopoietic cells. BD Horizon™ BV480 Rat Anti-Mouse CD44 isoforms encoded by variable exons are expressed on epithelial cells, but only at low levels on most leukocytes. Mice with the Ly-24.1 alloantigen (e.g., BALB/c, CBA/J, DBA/1, DBA/2) have relatively large subsets of CD44H+ T lymphocytes.