Fig. 7. Localisation of PATJ and Lin-7 proteins in sdt^K85-mutant adult photoreceptor cells upon expression of Sdt-encoding transgenes. Optical cross-sections of adult Drosophila eyes stained with anti-Sdt-N (A,B,C) or with anti-FLAG (D) (red), and with anti-PATJ (A,B) or anti-Lin-7 (C,D) (green). Phalloidin highlights the F-actin-rich rhabdomeres (blue). When Sdt-B2 is expressed in sdt^K85 mutant PRCs (A-A"), both Sdt (A) and PATJ (A') localise at the stalk membrane. Upon Sdt-PDZ expression in sdt^K85 mutant PRCs (B-B"), Sdt (B) and PATJ (B') co-localise at the rhabdomere base. When Sdt-L27C is expressed in sdt^K85 mutant PRCs (C-C"), Sdt (C), but not Lin-7 (B') localises at the stalk membrane. When Sdt-N is expressed in sdt^K85 mutant PRCs (D-D"), Sdt (D) and Lin-7 (D') are distributed throughout the cell.