CD33 and acute myeloid leukemia: For example, the U82759_at selected from the second run of BMSF on the Leukemia data encode HoxA9 (an Oncogene) that has a higher level of expression in the samples from AML patients than in the ALL patients[4]; the M23197_at gene selected on the third run encodes CD33 antigen (differentiation antigen) that is a membrane protein.