when susceptible cells are exposed to diphtheria toxin ( mr , 62,000 ) the n-terminal 21,150-dalton a fragment of toxin reaches the cytoplasm , where it catalyzes the transfer of adenosinediphosphoribose from nicotinamide adenine dinucleotide to elongation factor 2 ( ef2 ) .
C0007634
cells
C0010834
cytoplasm