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Fig. 4. YY1 expressed late in embryonic development can repress GAL4-NP6 expression. Embryos from hsp70GALYY1 X GAL4-NP6 crosses were heat shocked at various times, harvested at 18 h after laying, then processed for LacZ staining. Only YY1 induced at 15 h was able to strongly repress GAL4-NP6 activity.
