Fig. 4
Nrg1 type III is required in neurons and ErbB receptors are required in all Schwann cells. (A) Wild-type cells marked with a Texas Red-Dextran lineage tracer were transplanted into nrg1z26 mutant hosts carrying the Foxd3:GFP (green) transgene at the blastula stage. (B-B2) Lateral view of genetic chimera generated by transplanting wild-type cells (red) into the nrg1z26 mutant. Arrowheads point to nrg1z26 mutant Schwann cells, which have migrated along axons (arrows) of wild-type neurons (asterisks). Open arrowhead marks a wild-type Schwann cell. (C) Wild-type cells carrying the Foxd3:GFP transgene (green) labeled with a Texas Red-Dextran lineage tracer were transplanted into erbbst50 mutant hosts also carrying the Foxd3:GFP transgene at the blastula stage. (D-D2) Lateral view of genetic chimera generated by transplanting wild-type cells (red) into the erbbst50 mutant. All Schwann cells (arrowheads) are labeled by the wild-type lineage tracer. Anterior is to the left and dorsal is up in all images; embryos were genotyped after imaging. Scale bars: 50 μm. |