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High mobility group (HMG) nonhistone chromosomal proteins have been shown to exist also in the ciliated protozoan Tetrahymena pyriformis. One or two histone-like components were extracted with 0.25 M HCl from the chromatin, in addition to five histone species. These proteins were also extracted selectively with 0.5 M HClO4, 0.35 M NaCl, or 4 mM spermidine, together with H1 histone, and were characterized as HMG proteins on the basis of the following criteria: high mobilities on polyacrylamide gel electrophoresis, relatively low molecular weights, amino acid compositions rich in lysine and glutamic acid, and relative contents in chromatin. This extends the distribution of the HMG proteins to all four eukaryotic kingdoms, and suggests the possibility that they have some universal role in chromatin structure and function.
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