Application
ChIP assays were performed using NALM cells, CIITA antibosy and optimized primer sets for PCR. Sheared chromatin from 2 million cells and respectively 5 and 7 μg of antibody were used per ChIP experiment. An anti-flag antibody (lane 2) was used as negative IP control. Figure 1 shows the result of the end-point PCR with primers for HLA_DRA, used as positive control (lower panel) and for HLA_DOB, used a negative PCR control (upper panel).