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Monoclonal antibodies that specifically recognize caspase cleaved K18 fragments or specific (phospho)epitopes on intact K8 and K18 were used for a detailed investigation of the temporal and causal relationship of proteolysis and phosphorylation in the collapse of the keratin cytoskeleton during apoptosis. Caspases involved in the specific proteolysis of keratins were analyzed biochemically using recombinant...