Functional defect in the follicle cells.
Eggs from homozygous females are usually fragile and collapsed.
females produce morphologically abnormal eggs. temperature-sensitive. Eggs partially devoid of chorion; females fertile at 16oC and 23oC. Mosaic studies show gene function to be specific to soma (Wieschaus, Audit and Masson, 1981; Perrimon and Gans, 1983).
Germ line clonal analysis shows that fs(1)A473 function is required in the soma.