Fig. 6. Rescue of the so¹ mutant phenotype by the 1.6 kb element so7. (A) Schematic representation of the different so7 drivers in combination with the previously described so10 mutated elements. (B-E) Expression pattern of the different so7 drivers that have the extended so9 fragment. All panels show third instar eye discs with posterior to the left and dorsal to the top. (B) so7 shows additional expression in the ocellus region (arrow). (C) so7^EY/TOYmt completely loses expression in the eye disc but still has an extended expression in the ocellus region (arrow). (D) so7^TOYmt has normal expression in the eye disc but not in the ocellus region. (E) so7^EY+TOYmt only shows expression reminiscent of the additional 1 kb element at the posterior margin of the eye disc. (F-I) Rescue of the adult eye with the so7 drivers. The wild-type so7 and the so7^TOYmt show full rescue of the compound eye (F,H), whereas the removal of the EY binding sites does not rescue, or only partially in very rare cases (G). so7^EY+TOYmt never shows any kind of rescue (I). (J-M) Rescue of the ocelli with the so7 drivers. In contrast to the compound eyes, the TOY binding sites are absolutely required for ocelli development. (J,K) Rescue of the ocelli (arrowheads) with so7 (J) and so7^EY/TOYmt (K). No rescue is observed with so7^TOYmt (L) and so7^EY+TOYmt (M).