Figure 4. Relationship among di- and tri-methylated H3-K9 patterns, and HP1 pattern in dsetdb1^G19561 and Su(var)3–9¹⁷ germaria.

(A) H3K9me3 versus HP1 patterns. (B) H3K9me2 versus H3K9me3 patterns. (C) H3K9me2 versus HP1 patterns in wild-type (left panel), dsetdb1^G19561 (middle panel), and Su(var)3–9¹⁷ (right panel) flies. Note that HP1 is absent from the inner germarium of the dsetdb1^G19561 mutant, from which H3K9me3 signals are absent (in A), whereas H3K9me2 signals remain unaltered (in C). Nuclei were counterstained with 4′,6-diamidino-2-phenylindole (DAPI; blue). Scale bars, 10 µm.