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Figure 2


Fig. 2. PMC removal triggers ectopic expression of Lvalx1 in cells near the tip of the archenteron. WMISH analysis of Lvalx1 (A-G) and Lvtbr (H) expression. (A) Control mesenchyme blastula. Lvalx1 is expressed specifically by PMCs (arrow). (B) A PMC-deficient embryo immediately after surgery. (C,D) PMC-deficient embryos 4 hours after surgery, viewed laterally (C) and along the AV axis (D). Cells near the tip of the archenteron express Lvalx1 (C, arrow). In many embryos, Lvalx1-expressing cells are located predominantly on one side of the archenteron (D, arrow). (E,F) PMC-deficient embryos 5-6 hours after surgery, viewed laterally (E) and along the AV axis (F). Lvalx1 is expressed by cells at the tip of the archenteron (arrows), some of which have begun to migrate out of the epithelium. (G) PMC-deficient embryo, 9-10 hours after surgery. Lvalx1-expressing cells are migrating within the blastocoel (e.g. arrow) and some remain associated with the archenteron tip. (H) Lvtbr expression in a PMC-deficient embryo, 10-11 hours after surgery. Transfating NSM cells are organizing in a subequatorial ring pattern and express Lvtbr (arrow).





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