Figure 2.

The MHC phenotype of fz mutants. This portion of the wing contains the region of the anterior ventral surface used to quantify the MHCs of the fz alleles (see materials and methods). (A) Cells in a wild-type wing each secrete a single hair. (B) In a weak fz mutant, fz^SY, some cells may secrete more than one hair (red arrows). The number of MHCs increases in moderate (fz^MP) (C) and strong (fz^JB) (D) fz mutants. The number of MHCs observed in this region of the wing is a strong predictor of the severity of the phenotype observed in other tissues, such as the bristles on the dorsal thorax.