Soluble chromatin (600–700 ng) was immunoprecipitated with antibodies against C/EBP-β, p-C/EBP-β (T217), RNA Polymerase II (RNAPII), or a rabbit IgG (rIgG) control. (A) Typical PCR pattern obtained in ChIP assays using murine SerpinB2 proximal promoter-specific primers, 338/−315 and −5/+19, as diagrammed in top.