CSF2RB and leukemia: Bergstrom et al. used a different approach by targeting interleukin‐3 receptor α‐subchain (CD123), which is overexpressed relative to the β‐subchain (CD131) on leukemia stem cells with an Auger‐emitter 111In‐labeled DTPA‐NLS‐CSL360 radioimmunoconjugate.35