Mutants lack posterior spiracles but form a well developed A8 ventral denticle belt.

Ubx^MX12 abd-A^M1 Abd-B^M8 triple mutant embryos exhibit a normal head and anterior thorax, but the third thoracic segment and all the abdominal segments are transformed into the second thoracic segment. Embryos also develop a pair of sclerotic plates in the posterior part of the A8 segment. Heat activation of abd-A^hs.PS transforms the cephalic, thoracic and first abdominal segment into A2-A6 identity. The posterior abdomen exhibits transformation of A8 to the A2-A6 identity and presence of an extra belt in A9.

The second thoracic to the seventh abdominal segment develop as a composite of compartments from two segments. The identity of the eighth abdominal segment is complex: the anterior has characteristics of prothoracic and mesothoracic segments and the posterior may be cephalic. Abd-B^- embryos have an abnormal pattern of Dll expression at the extended germ band stage: Keilin's organs develop in the abdominal segments due to ectopic expression of Dll.

A5-A8 (including female genitalia) transformed to A4 in mosaics. Embryos have sclerotic plates in pA8 and occasional extra denticles in A9, and parasegments 10-13 are transformed to parasegment 9.

Abd-B^M8, Antp^Ns-rvC3, Scr^C1, Ubx^MX2, abd-A^M1 has embryonic epidermis phenotype, suppressible by Dfd^hs.PK

Abd-B^M8, Antp^Ns-rvC3, Scr^C1, Ubx^MX2, abd-A^M1 has embryonic epidermis phenotype, suppressible by lab^hs.PH

Abd-B^M8, Antp^Ns-rvC3, Scr^C1, Ubx^MX2, abd-A^M1 has embryonic epidermis phenotype, suppressible by Ubx^hs.PG

Abd-B^M8, Antp^Ns-rvC3, Scr^C1, abd-A^M1, hth^C1 has embryonic abdominal segment phenotype

Abd-B^M8, Antp^Ns-rvC3, Scr^C1, abd-A^M1 has embryonic abdominal segment phenotype

Abd-B^M8, Antp^Ns-rvC3, Scr^C1, Ubx^MX2, abd-A^M1 has embryonic epidermis phenotype