Fig. 8. A summary of the experiments. Results are shown for the tergite. Reversal of polarity is shown by arrows of different lengths, indicating the range, of one, several (two to four) or many cells (up to 10). The background genotype (e.g. fz^-) is shown outside the clone but also applies to the clone itself. The numbers refer to the genotypes listed in the Materials and methods. The asterisk refers to UAS.ft fz^- clones that reverse polarity in front only when located at the posterior of the A compartment (see text).