Fig. 1. Human and fly APC1 and APC2. (A-C) There are nine mutant
alleles of fly APC2: five point mutants in the Arm repeat region
(black arrows) and four truncations (blue arrows). We used a null allele of
APC1 (APC1Q8) resulting from a nonsense mutation
in Arm repeat 4 (Ahmed et al.,
1998).