PubMed:7749985 JSONTXT

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The specificity of CIITA for three major MHC class II genes, DR, DQ and DP, is mediated by its remaining C-terminal residues (amino acids 317-1130). The transactivation of multiple cis elements, especially S and X2, of the DR alpha proximal promoter in group II CID cells is CIITA dependent. Since CIITA overexpression in normal cells did not increase class II expression, we propose that initiation of CIITA expression serves as the on-off switch, while availability of downstream interactor(s) limits 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