B Immunohistological staining of liver sections from P120 PR-SET7ΔHepA mice and control littermates (WT) with H4K20Me1 and H4K20Me3 antibodies. Normal (Area-A), Necrotic (Area-B) and Regenerative (Area-C) hepatocyte-containing areas are indicated. Arrows show the loss of H4K20Me1 signal from the large necrotic nuclei. 