MCL1 and lymphoma: To explore the impact of B cell-restricted deletion of one or both allele(s) of Mcl-1 on c-MYC-driven lymphoma development, we generated Eμ-Myc mice with one or both Mcl-1 alleles flanked by loxP sites (hereafter called Mcl-1fl/+ or Mcl-1fl/fl, respectively).