Purification strategy for AE9a/AEtr and its associated factors. (A) Schematic representation of AE9a/AEtr fusion protein and the retroviral construct MigR1. Two constructs were used in the retroviral infection and transplantation experiments: MigR1-HA-AE9a and MigR1-FLAG-AEtr. (B) Purification scheme for AE9a/AEtr from leukemic mice.