Cultured cell, light micrograph

Cultured cell, light micrograph


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Cultured cell. Immunofluorescent light micrograph of an epithelial cell (round, upper right). The cell proteins are marked by fluorescent dyes. The actin cytoskeleton is green, bacteria are the blue dots, and red marks an activated protein called phosphotyrosine (a protein that plays a role in the regulation of cell growth). The actin fibres surrounding the cell at upper right end in areas of this activated protein. Yellow marks an overlap between green and red. Epithelial cells make up the body's internal and external surface layers, such as the skin and the walls of the intestines.

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