Morphology of the spinal ganglia viewed by haematoxylin-eosin staining. (A) A parasagittal section of the dorsal root ganglia in a stage 49 Xenopus tadpole is shown. The black arrow indicates ganglion 9. (B-D) Transverse sections of middle (B), distal (C) and regenerated (D) Xenopus tails. Arrow heads indicate the spinal ganglia in (B, C) and the arrow in (D) shows a "sporadic ganglion cell" in a regenerate. Scale bars: 500 μm in (A), 20 μm in (B-D).