C/EBP β (also known as CCAAT/enhancer-binding protein beta, interleukin 6-dependent DNA-binding protein, and nuclear factor of interleukin 6 [NF-IL6]) is a member of the basic leucine zipper C/EBP transcription factor family. C/EBP has three isoforms that include C/EBPβ, LAP, and LIP (35 kD, 32 kD, and 20 kD, respectively). This protein is localized in the nucleus and functions as a transcription factor in immune, inflammatory, acute-phase, cytokine, collagen type I gene expression. It is upregulated by growth hormones and has been shown to interact with CEBP-α, CEBP-δ, CEBP-γ, CEBP-ε, and CEBP-ζ. The C/EBP β protein can be modified by phosphorylation and ubiquitination. The 1H7 monoclonal antibody has been reported to be useful for Western blotting, immunoprecipitation, and immunofluorescence of mouse and rat C/EBP β , LIP, and LAP isoforms. The 1H7 antibody does not recognize human C/EBP β, LIP or LAP.