Fig. 7. Genetic interactions with ectopic hh. (A) Ectopic expression of hh produces excess somatic cells and long stalks. (B,C) Ectopic hh phenotype is partially suppressed in a da² heterozygous genotype; follicles are often compressed into an elongated shape (C). (D) The da mutant genotype (da^lyh/da²) is completely epistatic to ectopic hh. (E-H) Elevated da⁺ (DpB231; da^lyh) enhances the ectopic hh phenotype: (E) interfollicular cell number is increased (inset: loss of region 3 cyst characteristic of excess da⁺). (F) Frequent branched stalks usually terminate with otherwise detached follicles to form ‘lollipop-like’ structures. (G,H) Enlarged view of ‘lollipops’. Staining: Hts (green), Vasa (magenta), DAPI (grayscale).