Diagram properties and expression of C/EBPα proteins. (A) Diagram depicting C/EBPα (p42), the location of C/EBPαLZ in-frame duplications and deletions, truncated C/EBPαp30, the basic region mutant C/EBPαBR3, and C/EBPβ or its LIP isoform. BR indicates basic region; LZ, leucine zipper; TAD, trans-activation domain; REP, repression domain. (B) Properties of the C/EBP variants used. (C) Total cellular proteins extracted from parental Ba/F3 cells or clones expressing the indicated C/EBPα isoforms were subjected to Western blotting with the use of C/EBPα or actin antisera.