Fig. 4. Ultrastructural analysis of a phenotype lacking the blastema, as a consequence of DjPum RNAi in D. japonica. (A) Wound region of a DjPum dsRNA-injected fragments, 3 days after the second transection. (B) A 3-day-old blastema region from a water-injected control is shown for comparison. uc, unspecialized, neoblast-like cells; we, wound epidermis; bl, basal lamina. Scale bar: 10 µm.