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Fig. 5. Attraction of chick r4 ventral motoneurones is specific to mouse r5/6. Diagrams of r5/6 chick ablation (A), orthotopic r5/6 graft (C) and heterotopic mouse-chick graft (E). (B,D,F) Dorsal views of flat-mounted HH stage 24 hindbrains after chick Hoxb1 in situ hybridisation. (B) The most severe case in which very little regeneration of the surrounding tissue has occurred and chick Hoxb1 expression is dramatically enlarged. (D) No obvious changes in chick Hoxb1 expression resulted after cr5/6 orthotopic grafts. (F) By replacing cr5/6 with mr2/3, chimaeric embryos showed a slightly enlarged chick Hoxb1 domain, but no extension of ventral expression.