Abstract
Using a gel retardation assay and exonuclease III footprinting, we have analyzed sequence-specific DNA-binding nuclear factors which interact with the distal promoter element of the rat tyrosine aminotransferase gene. A factor called LspA1, binding to a sequence that resembles the consensus binding site for the transcription factor Ap-1, was shown to be present in adult rat-liver nuclear protein extracts but not in the extracts from embryonic liver or spleen nuclei.
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