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Fig. 6. (A-D) Car-Cre/Lox-GFP transgenics expressing GFP in the myofibres after intrachromosomal recombination. (E-H) Car-GFP transgenics expressing GFP in all myofibres. (A) Stage 28 NF embryo showing a few somitic cells starting to express GFP. (B) Stage 49 tadpole, before tail amputation, expressing GFP in numerous myofibres. (C) Regenerating tail 3 days after amputation showing no GFP-labelled cells in the blastema. (D) Five-day regenerating tail starting to express GFP in a few new myofibres. (E,F) Stage 28 embryo and stage 49 tadpole expressing GFP in the muscle under control of the cardiac actin promoter (Car). (C) Three-day regenerating tail showing no GFP-labelled cells in the blastema. (D) Five-day regenerating tail showing substantial new formation of labelled myofibres. White bar indicates amputation level. Scale bars: 200 µm.