Regulation of transcription of a specific gene involves sequences very close to the start of transcription as well as sequences that are many base pairs away from the transcription start site. You are using these sequences to drive expression of luciferase and monitor gene expression after you delete or modify these sequences. You delete the sequences that are located many base pairs away from the start of transcription and find that luciferase activity increases. What type of regulator did you most likely delete?