Amino acid replacement: H383Y.
Nucleotide substitution: C1147T.
Adults carrying fz37E2.Act5C in a fz21 background have an average of 1.7 +/- 0.5 extra tarsal joints in the leg compared to wild type.
fz37E2.Act5C rescues the wing margin phenotype of fz21 fz2C1 double homozygous clones.