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If the binding activity was purified, suggest two experimental approaches that could be taken to
verify that this factor is in fact a transcription factor? Explain. (4 marks)
An electrophoretic mobility shift assay (EMSA) was performed using a radiolabeled DNA
fragment from the sequence upstream of gene X . This DNA probe was incubated with (+) or
without (-) nuclear extract isolated from tissues A (bone); B (lung); C (brain); and D (skin). The
DNA-protein complexes were then fractionated on nondenaturing polyacrylamide gels. The gels
were exposed to autoradiographic film; the results are presented in the figure.

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