CD33 and acute myeloid leukemia: To fill in this knowledge gap, we analyzed seven myeloid (HEL, K-562, THP-1, U937, KG-1a, HL-60, DAMI) and five lymphoid (DAUDI, RAJI, NALM-6, JURKAT, MOLT4) cell lines as well as primary CD33+ AML and CML patient leukemic blasts to see whether they express C3aR and C5aR, according to RT-PCR (17).