Figure 7.4 Endo16 transcription during sea urchin developmen

核心提示：A) and B) Using in situ hybridization, Endo16 mRNA is visible in 20-hour-old blastulas, C) a 30-hour-old blastula at the beginning of gastrulation, D) a 48-hour-old gastrula, E) a 60-hour-old embryo as it begins to take on the triangular shape