passages.id: 1.0alpha7.train.169.sent
passages.type: sentence
passages.text: In support of this hypothesis, PU.1 binding to the μB site is undetectable in EMSA analyses of B cell nuclear extracts despite the demonstrations that 1) DNA-binding PU.1 is present in B cell nuclei and 2) recombinant PU.1 binds the μB site in a variety of analyses (3, 25, 41).
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