Our previously published data indicated that SerpinB2 is distinctly regulated from other LPS-inducible genes in terms of kinetics, LPS dose response and sensitivity to IFN-γ co-stimulation [4]; however, the cis-acting elements in the SerpinB2 promoter responsible for LPS-dependent transcription in macrophages and the specific LPS-responsive transcription factors that bind the SerpinB2 promoter were not defined.