MAPK3 and chronic myelogenous leukemia, BCR-ABL1 positive: BM cells from tamoxifen‐treated Prmt1fl/fl; Cre‐ERT2 or Prmt1fl/fl mice were transduced with BCR‐ABL‐GFP retrovirus and transplanted into sublethally irradiated recipients to induce CML (Figure S3A, Supporting Information).