... Coaddition of the twoantibodies resulted in the loss of bands C1, C2, and C3 (lane13). In contrast, the use of a control monoclonal antibodyagainst SREBP did not affect the formation of any of the complexes ... be involved in increasing the DNA binding and transcriptional activities of Sp1. As shown in Fig. 4A, two DNA–protein complexesother than C1, C2, and C3 were detected in PMA-treatedcells, the ... facilitating theirbinding to GC-I and enhancing their transcriptional acti-vity. On the basis of these results, we cannot rule out the possibility that other factors binding to probe I may interactwith...