ChIP results obtained with the antibody directed against H4pan
ChIP assays were performed using human HeLa cells, the antibody against H4pan (Cat. # 25278) and optimized PCR primer sets for qPCR. ChIP was performed on sheared chromatin from 10,000 cells. A titration of the antibody consisting of 1, 2, 5, and 10 µg per ChIP experiment was analyzed. IgG (1 µg/IP) was used as negative IP control. QPCR was performed with primers for the ACTB promoter and for the second exon of the MB gene. Figure 1 shows the recovery, expressed as a % of input (the relative amount of immunoprecipitated DNA compared to input DNA after qPCR analysis).

Determination of the titer
To determine the titer of the antibody, an ELISA was performed using a serial dilution of the antibody directed against H4pan (Cat. # 25278), crude serum and flow-through in antigen coated wells. By plotting the absorbance against the antibody dilution (Figure 2), the titer of the antibody was estimated to be 1:11,250.

Cross reactivity test using the antibody directed against H4pan
A Dot Blot analysis was performed to test the cross reactivity of the antibody against H4pan (Cat. # 25278) with the peptide used for immunization of the rabbit and other peptides containing unmodified sequences of different histones. One hundred to 0.2 pmol of the respective peptides were spotted on a membrane. The antibody was used at a dilution of 1:10,000. Figure 3 shows a high specificity of the antibody for the specific peptide. 

Store at –80°C for up to 2 years. Centrifuge after first thaw to maximize product recovery. Aliquot to avoid repeated freeze/thaw cycles. Aliquots may be stored at –20°C for at least one month.