Amino acid replacement: R274C.
Nucleotide substitution: C820T.
Adults carrying fz73A2.Act5C in a fz21 background have an average of 1.6 +/- 0.5 extra tarsal joints in the leg compared to wild type.
fz73A2.Act5C rescues the wing margin phenotype of fz21 fz2C1 double homozygous clones.