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SDS-PAGE analysis of the inhibition of proteolytic activity by EDTA. Lane 1, histone; lane 2, histone plus apo-NCS from Streptomyces; lane 3, histone + apo-NCS from Streptomyces plus EDTA; lane 4, histone plus apo-NCS from E. coli; lane 5, histone + apo-NCS from E. coli plus EDTA.
