Nuclear transcription factors of genes important for mitochondrial biogenesis
(A) NFκB p65 (n=3) and (B) Sp1 (n=6) protein levels in response to 4 days of differentiation. Representative blots are shown with the graphical quantification below. Values are expressed as means±S.E.M. *P<0.05, day 2–4 compared with day 0.