Fig. 3. Mutations in vri decrease hair and cell size in adult cuticle. y/y; vri/vri somatic clones were induced at third larval instar by the FLP/FRT technique and observed in females. (A) y/y; vri²/vri² clonal left posterior scutellar macrochaete (arrow) with a reduced size compared with the y⁺/y; vri⁺/vri right one. (B) vri¹ clone showing a socket with no macrochaete on the head (arrow). (C) vri⁵ clones with pigmented cuticle. (D) y/y; vri⁵/vri⁵ clones at the wing anterior margin in the triple row region with smaller and thinner stout mechanosensory bristles. The space between bristles is reduced (vertical arrows), which is characteristic of smaller cells, and the margin is concave (double-headed arrow). (E) At the anterior wing margin, the average distance between stout bristles of the triple row is significantly reduced in y/y; vri/vri clones (Student's test: P<0.001) compared with y/y; vri⁺/vri⁺ clones. The values are percentages of wild type±s.e. Clones, analyzed from 12 to 31 wings, contained from two to 33 bristles.