Amino acid replacement: P278S.
Nucleotide substitution: C832T.
Adults carrying fz18B3.Act5C in a fz21 background have an average of 1.0 +/- 0.0 extra tarsal joints in the leg compared to wild type.
fz18B3.Act5C rescues the wing margin phenotype of fz21 fz2C1 double homozygous clones.