Amino acid replacement: E373K.
Nucleotide substitution: G1117A.
Adults carrying fz11A2.Act5C in a fz21 background have an average of 0.9 +/- 0.3 extra tarsal joints in the leg compared to wild type.
fz11A2.Act5C rescues the wing margin phenotype of fz21 fz2C1 double homozygous clones.