the predominant ultrastructural abnormality seen after exposure to 0.40 mm novobiocin for 24 h was the presence of electron-dense clumps in the mitochondrion-kinetoplast organelle in 95 of 257 ( 37 % ) of cells , in comparison to no clumps seen in 110 drug-free cells .
C0026237
mitochondrion
C0007634
cells