Contribution of the host animal to blastema derived ectopic tails. 24 hours old blastemas obtained after tail amputation of stage 50 wild type tadpoles were transplanted into hosts of the tom3 strain. After 21 days tadpoles were investigated. A-B: Tail like outgrowth in the trunk shown in the bright field (A) or with red fluorescence filter set (B). C-D: Isolated ectopic tail (upper structure) together with wild type tail shown in normal light (C) or with red fluorescence filter set (D). Scale bars equal 1 mm. The arrows mark the tail-like outgrowth.