Amino acid replacement: P390L.
Nucleotide substitution: C1169T.
Adults carrying fz26C2.Act5C in a fz21 background have an average of 2.4 +/- 0.5 extra tarsal joints in the leg compared to wild type.
fz26C2.Act5C partially rescues the wing margin phenotype of fz21 fz2C1 double homozygous clones.