Dorsal view of neuroblast clones showing Ultrabithorax expression and genetic manipulation in lineage 19. Insets: Ubx expression (magenta) at mid-clone. (A-D) Wild-type clones. (A) Bundle 19c is thin and truncated in T1. (D) Bundle 19i is absent in A1. (E-H) dronc- clones. (E) Bundle 19c is robust in T1. (H) Bundle 19i is present but lacks elaboration in A1. (I-K) Ubx- clones. Bundle 19c is very thin in all segments. (L-N) UAS-Ubx clones. Bundle 19i is missing in all segments. White or green, anti-CD8. Ubx: Ultrabithorax.