Fig. 4. Final size is not affected by differential growth rates. (A) P/A ratio in adult wings that are wild type or heterozygous for M(3)67C, (M/+), ci-M⁺ and en-M⁺. (B,C) Wings of ci-M⁺ (B) and en-M⁺ (C) genotypes showing that the A and P compartments match perfectly well in spite of having had different growth rates. In each case, the M⁺ tissue is labelled with mwh and jv. (B',C') Are amplifications of the central regions of the wings. A sharp border exists between mwh tissue in the ci-M⁺ wing (red line) compared with the `wiggly' mwh border in the en-M⁺ wing. This is due to the late tier of en expression induced by Hh (Blair, 1992).