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Fig. 4. Summary of temporal patterns of gene expression within embryonic lens ectoderm in Xenopus laevis. Windows of expression are correlated with specific stages of development and to different phases of lens induction, tissue competence, and lens forming-bias as defined in the text and Figure 1. A: Different embryonic stages are represented on a time line of early development. B: Temporal windows of lens forming bias, competence, and induction are mapped onto the time line of early development. C: Temporal windows of gene expression within the de- veloping lens ectoderm are mapped onto the time line of early develop- ment. Data are based on the results of this study, as well as that of previous studies (Pannese et al., 1995; Kablar et al., 1996; Hirsch and Harris, 1997; Penzel et al., 1997; Zygar et al., 1998; Schaefer et al., 1999; Kenyon et al., 1999; Hollemann and Pieler, 1999; Zhou et al., 2000; Ishibashi and Yasuda, 2001; Pommereit et al., 2001). |
