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Electrophoretic separation of archaeal histone–DNA complexes. Aliquots (50 ng) of linear pBR322 DNA were incubated without (dash) and with 20, 50, 100, 150 or 200 ng of HMtA2, or HMtB(R19)-HMtA2, or HMtB(I19)-HMtA2. The reaction products were separated by agarose gel electrophoresis and visualized by ethidium bromide staining
