Fig. 9. WUS expression in wild-type and laterne (pid-15 enp/pid-15 enp) embryos. (A-C,E,G) Wild-type, (D,F,H) laterne. (A) WUS expression is found in L2 and L3 in wild-type globular stage. (B) Signal restricts to L3 in early heart stage (arrowhead). (C,D) Cross-section series of wild-type heart stage (C) and laterne torpedo stage (D), both with wild-type signal location. (E) Median section of the wild-type shows shoot apical pole and only part of one cotyledon (co) with WUS signal in L3. (F) Higher magnification of comparable laterne region exhibiting the same location in L3 (tissue layers L1-L3 indicated). (G,H) Longitudinal section of late torpedo stage wild-type (G) and laterne (H) with WUS signal. The inset (H) shows sense hybridisation. co, cotyledon; hy, hypocotyl. Scale bars: 20 µm.