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Nucleosome arrays associated with heterochromatic DNA sequences. Blots containing DNA samples from nuclei digested with MNase as described in the legend to Fig. 2 were hybridized with a 1-kb DNA fragment that flanks the HS-5 insertion site (A) or a 4.5-kb F-element fragment (B). Linker sites cleaved by MNase are indicated by arrowheads.
