Fish skin cells. Epifluorescence light micrograph of three keratocytes (fish epidermal cells). The nuclei, which contain the cells' genetic information in the form of deoxyribonucleic acid (DNA), are pink. Microtubules are green and actin is purple. Microtubules and actin are protein filaments, they form the cell cytoskeleton, which gives the cell its shape and the capacity for directed movement. When scales are plucked and placed on a glass slide, individual cells become extremely motile due to a wound healing response. As they also have a simple structure, these cells are used as a model system to study cell locomotion, metastasis (spread) of cancer cells, and wound healing.
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