following transfer of these mutant cells from the permissive temperature of 39.5 to 33 degrees c , a transient increase in both cytochrome c oxidase and dna polymerase gamma was observed , the ratio of total mitochondrial volume to cell volume nearly doubled within 6 days , and numbers of mitochondrial cross-sections per cellular cross-section as determined in electron micrographs underwent a threefold increase .
C0026237
mitochondrial
C0007634
cellular