analysis of the pre-existing mit-dna in these cells , which had been long-term labelled with [ 5-3h ] deoxycytidine , showed a progressive decrease , with increasing duration of irradiation , in the proportion of the closed-circular form and an increase in that of the open-circular form of mit-dna , with the subsequent appearance of fragments of this dna .
C0007634
cells
C0026237
mit-dna