Human umbilical cord cells. Light micrograph of endothelial cells in a human umbilical cord, the structure that supplies blood and nutrients to a foetus. Fluorescent dyes have been used to show the cell structures. Actin filaments are red, the cell nuclei are light blue, and microcorpuscules containing Von Willebrand factor are green. Actin is the most abundant cellular protein, forming part of the cells' cytoskeleton, the system that is responsible for intracellular transport, and the structure and motility of the cells. The cell nuclei contain the cells' genetic information, DNA (deoxyribonucleic acid), packaged in chromosomes. Von Willebrand factor is a blood clotting protein.
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