ChIP experiments on CD19 and BLK promoters. (A) PCR amplification of the CD19 promoter fragments after ChIP: PAX5-ELN binds CD19 promoter sequences as PAX5. (B) PCR amplification of the BLK promoter. PAX5-ELN binds BLK promoter sequences as PAX5. (C) Non-PAX5 target sequence PCR control. PCR amplification of the SERPINA1 promoter.