Fig. 6. The cell-lineage restriction border between segments A9 and A10-11. (A,B) Several samples of smo^- clones induced in the region around the segmental border between segments A9 and A10-11. Clones (thinner outline) and their sister twins (thicker outline) are marked by GFP expression. The segmental border is marked by hh-lacZ expression. Clones 1 and 2 (A) are induced in the P compartment of A9, and clones 3 (A) and 4 (B) are located in the anterior compartment of A10-11. (C) smo cad double mutant clones (5 and 6) induced in the anterior region of A10-11. Note that 3, 4, 5 and 6 clones abut but do not straddle the segmental border between A9 and A10-11. See schemes on the right of the figure to locate the clones in the genital discs. 1'-6' indicate the corresponding twin clones.