HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Sea urchin embryo. Light micrograph of a sea urchin embryo during gastrulation. Cells from the vegetal pole (upper left) create a groove (blastopore) and migrate into the centre of the embryo. These cells, which make up the endoderm, form the digestive tract, glands and lungs. At bottom right is the animal pole, which makes up the ectoderm. The ectoderm, which forms epidermis and nervous tissue, will grow to cover the blastopore. The cells to either side of the invagination are mesenchyme cells and make up the mesoderm, which forms the connective tissue, including blood vessels and cartilage. Magnification: x452 when printed at 10 centimetres wide.
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