Changes in mtDNA during cell senescence.

1. Digestion of DNA samples 5 mg total DNA in each lane from Taipei 309 seedlings and cells with BamHI. From left to right: DNA marker and DNA from seedlings, 1-, 2- and 3-week-old cells.
   
   
2. The hybridisation of 5' end of coxII (the PCR product) to the BamHI digested DNA samples from Taipei 309 seedlings and cells. Lane 1, DNA sample from Taipei 309 seedlings, lanes 2-4 DNA samples from 1-, 2- and 3-week-old cells.