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Transcription repressor that binds to the promoter of target genes and prevents their expression. Acts as anegative regulator of epithelial-mesenchymal transition and metastasis in breast cancer. Specifically binds the5'-CACCC-3' sequence in the promoter of ID1, a key metastasis regulator in breast cancer, and repress its expression.May be a germ cell-specific transcription factor that plays important roles in spermatid differentiation and oocytedevelopment
