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Normal X-Y pairing vs. pairing at euchromatin (hatched boxes). (A) Wild type showing rDNA pairing sites. (B) In(1)sc4Lsc8R X lacking rDNA. The locations of the X duplications on the collection of Dp(1;Y)s tested are indicated above the X. Dp(1;Y)BSC76 is shown paired with its euchromatic homology on the X.
