Fig. 6. Ser is regulated by the Egfr pathway. Wings of wild type (A), UAS-rho^* (Egfr gof; C), and rho¹vn¹ (Egfr lof; E) at 28 hours after puparium formation, with their corresponding adult wings (B,D,F). Ser mRNA was detected by in situ hybridization (A,C,E). (A) Ser expression in the wild-type provein cells. (C) Ser is ectopically expressed between L3 and L4 (arrow), where the ectopic veins are developed (arrow in D). (E) Ser expression is not seen in the wing without veins (F).