Fig. 7. Cell autonomous and nonautonomous effects of Gug mosaic clones for proximal identity in the leg. The right panels show higher magnifications of the panels on the left. (A) The proximal region of a second leg showing the region between bracted (arrow) and non-bracted (arrowhead) bristles in the femur. Distal to this border, almost all bristles have bracts. (B) A proximal Gug^– M⁺ clone filling a large region of the anteroproximal part of a second leg. Coxa, trochanter and proximal femur are replaced with unpatterned leg tissue. Bristles show more distal (arrows) identity. Note that bristles change their polarity in a autonomous and non-autonomous (arrowhead) manner. (C) A clone, induced at 120-144 hours, where a secondary leg axis protrudes from the ventral region of the proximal femur and trochanter region. The ectopic leg is incomplete, consisting of mosaic y Gug^– and Gug⁺ cells. Gug⁺ cells in the ectopic leg have formed large bristles (arrow) typically found in the distal leg. We believe that these bristles have dorsal identity that represents the preapical bristle of the tibia.