Fig. 2.

Truncations from the 5′-End of the Enhancer Indicate that the −1782 Oct-1 Site or an Upstream Site between −1800 and −1780 Is Important for Suppression of Transcriptional Activity by TPA

Reporter plasmids containing series of deletions were made using PCR approaches and transfected into GT1–7 cells. Reporter activities were assayed and analyzed as described in Fig. 1 and Materials and Methods. Data are mean ± SE of four experiments, with each conducted in triplicate or quadruplicate. Groups labeled with different letters are significantly different from each other.