Figure 6.
Increase of mtDNA during neuronal differentiation. A. Total cellular DNA was prepared from undifferentiated cells and from cells at days 4 and 11 of the differentiation program. 10 μg samples of DNA were digested with EcoRI, fractionated by agarose gel electrophoresis, transferred to a Hybond N+ membrane and probed with a mixture of 32P-labeled probes to detect both nuclear rDNA and mtDNA. Hybridization of probes to DNA was detected and quantified with a phosphorimager. B. Quantification of mitochondrial DNA to nuclear ribosomal DNA.