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Imprecise excision of the P{PZ}rF139 insertion, resulting in a deletion of approximately 15kb that deletes pgc, T3dh and Gp150.
Df(2R)pgcΔ1/Df(2R)X58-7 animals carrying Gp150+t17.5 to rescue Gp150 function are fertile and embryos derived from these females form normal numbers of pole cells. However, the pole cells degenerate from stage 10 onwards, and few or no pole cells coalesce into the gonads. 80% of these embryos develop into sterile adults.