1. More the plant will become older, more endoderm will lignify. 2. The formation of the pancreas from endoderm begins in early development. 3. Extraembryonic endoderm ( including Yolk sac ) is derived from hypoblast cells. 4. Like in other arthropods it is derived from the endoderm . 5. Mesentoblasts are found in the blastopore area between the endoderm and ectoderm. 6. Early in development, Fox1-driven Nodal expression establishes the visceral endoderm . 7. They found that ectoderm was more potent than endoderm . 8. The endoderm consists at first of flattened cells, which subsequently become columnar. 9. It is formed by ectoderm and endoderm coming into contact with each other. 10. Expression of HEX1 and HESX1 marks the anterior visceral endoderm of the embryo.
