Ectopic tail formation after blastema transplantation. 24 hours old blastemas obtained after tail amputation of stage 50 tadpoles of the tom3 strain were transplanted into wild type hosts of the same stage. After 21 days tadpoles were investigated. A-C: Tail like outgrowth in the head region: B: close-up C: red fluorescence filter set. D-F: Tail like outgrowth in the trunk: E: close-up F: red fluorescence filter set. Scale bars equal 1 mm expect in B 100 μm. The arrows mark the tail-like outgrowth.