CD34 and acute myeloid leukemia: We quantitatively evaluated the relative expression of CD45RABC-E of CD34+ AML compared with that of CD34+ HSPCs by performing densitometry of HECA-452-stained Western blots of CD45RABC-E immunoprecipitants (immunopurified using anti-CD45RA) of five AML specimens compared with immunoprecipitants of three native bone marrow (BM) CD34+ HSPC specimens.