Fig. 4. GFP-labelled grafts of the three embryonic tissues to the presumptive tail region. (A-C) Embryo stage NF37. (D-F) Tadpole stage NF 49. (G-I) Transverse sections of caudal region of host at tailbud embryo stage NF 37. (L-N) sections of tail at tadpole stage NF 49. The sections of the three different graft types are immunostained with anti GFP (red/brown) and counterstained with Haematoxylin (blue) showing specific labelling of each of the three tissue types. Scale bars: 100 µm.