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It is expected that the subnuclear localization of a protein in a fixed cell, detected by microscopy, reflects its position in the living cell. We demonstrate, however, that some dynamic nuclear proteins can change their localization upon fixation by either crosslinking or non‐crosslinking methods. We examined the subnuclear localization of the chromatin architectural protein HMGB1, linker histone...
Phenomena involving the disassembly of chromosomes to ∼50 kbp double-stranded fragments upon protein denaturing treatments of normal and apoptotic mammalian nuclei as well as yeast protoplasts may be an indication of special, hypersensitive regions positioned regularly at loop-size intervals in the eukaryotic chromatin. Here we show evidence in yeast cell systems that loop-size fragmentation can occur...
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