Fig. 1. F-actin-containing structures in early Xenopus embryos. (A) Animal caps removed from late blastulae (stage 9) and photographed immediately after excision (0 minutes) or 10 minutes after healing (B). Scale bar: 125 µm. (C,D) Low- and high-magnification views of F-actin staining of the actin network of a late blastula animal cap. Scale bars: 20 µm in C; 5 µm in D. (E) F-actin staining of an animal cap that had been removed from the embryo and allowed to heal for 10 minutes. Arrow indicates the purse-string. Inset shows a high-power view of the inner cells of the cap. Scale bar: 50 µm. (F) High-magnification image of area outlined in E showing the contractile ring and coarser actin filament network in a dividing cell. Scale bar: 5 µm.