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Automated microscopy identifies estrogen receptor subdomains with large‐scale chromatin structure unfolding activity

Recently, several transcription factors were found to possess large‐scale chromatin unfolding activity; these include the VP16 acidic activation domain, BRCA1, E2F1, p53, and the glucocorticoid and estrogen steroid receptors. In these studies, proteins were fluorescently labeled and targeted to a multimerized array of DNA sequences in mammalian cultured cells, and changes in the appearance and/or size of the array were observed. This type of experiment is impeded by the low throughput of traditional microscopy.