Amino acid replacement: W561R.
Nucleotide substitution: T1681C.
Adults carrying fz70A2.3.Act5C in a fz21 background have an average of 2.1 +/- 0.3 extra tarsal joints in the leg compared to wild type.
fz70A2.3.Act5C rescues the wing margin phenotype of fz21 fz2C1 double homozygous clones.