Summary of ChIP-chip and classical ChIP experiments.

1Results of independent CIITA-ChIP-chip experiments performed with NimbleGen promoter arrays: + signs indicate the presence of a peak in the signal ratios; the number of + signs refers to the quality of the peaks; +++ indicates strong signals (log2 ratio > 2) at four or more adjacent oligonucleotides or weaker signals at more than four adjacent oligonnucleotides; ++ indicates strong signals at three adjacent oligonucleotides or weaker signals at four adjacent oligonucleotides; + indicates strong signals at two adjacent oligonucleotides or weaker signals at three adjacent oligonucleotides.2Results of classical CIITA-ChIP experiments: positive, confirmed binding; negative, absence of binding; nt, not tested.