EGFR and cyst: We drove expression of constitutively active EGFR or Sprouty RNAi in adult hub cells (using E132-Gal4, Gal80ts) or Argos RNAi in adult cyst lineage cells (using C587-Gal4, Gal80ts), but we found no ectopic niches in any testes (n = 35, 285, or 291 testes, respectively).