Heterozygotes exhibit shortening of wing vein L5.
HC21 is an enhancer of wing vein L4 phenotype of Egfrt1
Egfrt1, HC21 has ocellar bristle phenotype
Egfrt1, HC21 has anterior orbital bristle phenotype
HC21, vnC221 has wing vein L5 phenotype
HC21, vnC221 has wing vein L4 phenotype