Figure 1.

Polycomb enhancement phenotypes of hsc4^54.1. (A) The abdominal cuticle of a wild-type female. (B) The abdominal cuticle of a 54.1/Pc³ female. Note that the first abdominal tergite (marked 1t) is transformed to the character of the second abdominal segment. Likewise, the sixth abdominal tergite (6t) and sternite (6s) are transformed to the character of the seventh abdominal segment. The seventh tergite and sternite are almost completely removed, partially transformed to the eighth abdominal segment. (C) The wing from a 54.1/Pc³ adult. Patches of wing tissue are transformed to the character of haltere, especially along the posterior margin (arrowhead). (D–F) Legs from a 54.1/Pc³ male. (D) The first thoracic leg, which shows a row of sex comb teeth (arrowhead) characteristic of the wild-type male foreleg. (E) The second thoracic leg. Note the complete row of ectopic sex comb teeth (arrowhead). (F) The third thoracic leg. There is a partial row of ectopic sex comb teeth (arrowhead).