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Structure of dvl1 alleles. Black boxes are coding segments, and the white box is the intron. Transcription is from left to right. Arrows are oligonucleotides (see Materials and Methods). (E) EcoRI. The boxed sequence is from the intron and Tam3. Numbers above the box are positions in Tam3 (Hehl et al. 1991). The sequence in bold is the target duplication produced by the insertion of Tam3. The line at the bottom shows the deletion in dvl1-0.
