Table 2. Transcription factors with statistically enriched cis-elements in the promoters of genes encoding for subunits of mitochondrial respiratory chain.

Transcription factor family	p-value (Fisher's exact test)	Transcription factors
SP1	1.52E-09	SP1, SP4
E2F	2.79E-08	E2F1, E2F2, E2F3, E2F4
KLF	0.000265	KLF2, KLF6, KLF7, KLF15
ETS	0.000796	ELK1, SPI1, ETV1