Abstract
Distinct in situ 10 nm non-chromatin fibers exist within the macronucleus of the ciliated protozoanEuplotes eurystomus. Their presence is detected after permeabilizing cells in a cytoskeleton-stabilizing buffer and then fixation with glutaraldehyde-tannic acid, followed by OsO4. The 10 nm fibers are primarily localized within condensed chromatin and within the forward zone of the replication band. Although their functional role is unclear, it is suggested that they may constitute a structural framework for organization of the very large number (ca. 108) of macronuclear minichromosomes.
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