Fibroblast cells. Fluorescent light micrograph of two fibroblast cells, showing their nuclei (green) and cytoskeleton. The cytoskeleton is made up of microtubules of the protein tubulin (yellow) and filaments of the protein actin (blue). The cytoskeleton supports the cell's structure, allows the cell to move and assists in the transport of organelles and vesicles within the cell. Fibroblasts are cells forming connective tissue, and are responsible for secreting connective tissue proteins such as collagen. Magnification: x980 when printed 10cm wide.
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