Amino acid replacement: H383L.
Nucleotide substitution: A1148T.
Adults carrying fz72A4.Act5C in a fz21 background have an average of 1.3 +/- 0.5 extra tarsal joints in the leg compared to wild type.
fz72A4.Act5C rescues the wing margin phenotype of fz21 fz2C1 double homozygous clones.