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The binding of acridine orange and ethidium bromide to rat liver chromatin increases by 30% one hour after partial hepatectomy, returns to the control level by the second hour and increases again by the sixth hour. The changes described were found in investigations carried out on whole cells, on isolated nuclei, and on chromatin preparation in vitro. Increased ligand binding disappears after the treatment of the one-hour chromatin with a 0.3 M NaCl solution, but such a treatment does not change the binding of ligands to chromatin obtained six hours after hepatectomy. The one-hour chromatin is characterized by elongation of distances between individual nucleosomes whereas the two-hour chromatin is the same as in control.

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