Fig. 6. Examples of whole-mount in situ hybridization. (A) 001D02 in the 110-cell embryo. Vegetal view. Anterior is upwards. (B) 003O15 in the early tailbud embryo. The signals are seen in multiple regions in a complex manner in terms of cell lineage or germ layers. Anterior is towards the left. (C) 004D21 in the 110-cell embryo. The expression is detected in every blastomere except the endodermal cells. (D) 011F04. (E) 008B07. (F) 006L20. The maternal RNA of each clone is localized in the postplasm while the zygotic expression is seen in the epidermis and adhesive organ (D), the nervous system, adhesive organ and endodermal strand in (E) and in the trunk lateral cells (F), respectively.