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DNA footprinting is a powerful technique used to identify the specific binding sites of transcription factors on a DNA sequence, particularly in promoter regions. The basic principle of DNA footprinting involves the protection of certain DNA regions from cleavage by nucleases, which occurs when a protein binds to that region. In this method, a labeled DNA fragment, typically a promoter _________ _______ ______ _____ _____ _____ _________ _________ ______.
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