Fig. 5. RNA transcripts from rearrangement Uab alleles. (A) A map of the BX-C showing the positions of the Uab rearrangement breakpoints. Fragment B (red box) was used to make a strand-specific probe to detect rightward transcripts (directed towards abd-A). (B) Stage 13 embryo from Uab¹/ap^Xa parents. There is abnormal transcription in PS6-12, plus transcription in the posterior end of the embryo, probably representing PS14. (C) Stage 13 embryo from T(1:3) Uab⁵/FM6xFM6 parents. Ectopic RNA appears throughout the central nervous system, and in lateral clusters of cells (probably in the peripheral nervous system) in the first through seventh abdominal segments.