Figure 4From: piRNA clusters and open chromatin structureMost Drosophila Piwi-interacting RNA (piRNA) clusters are found near the boundary zone between euchromatin and heterochromatin. The boundary between euchromatin and heterochromatin of Drosophila is gradual rather than acute. Most Drosophila piRNA clusters exist in the boundary zone between euchromatin and heterochromatin.Back to article page