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We have generated human recombinant keratins K8 and K18 and describe conditions to quantitatively follow their assembly into filaments. When renatured individually from 8M urea into a low ionic strength/high pH-buffer, K8 was present in a dimeric to tetrameric form as revealed by analytical ultracentrifugation. In contrast, K18 sedimented as a monomer. When mixed in 8M urea and renatured together,...