Mesenchymal stem cells. Fluorescence light micrograph of mesenchymal stem cells (MSCs), a form of stromal (connective tissue) cells that can differentiate into a a variety of cell types, including bone, muscle, cartilage, and fat. The cells have been stained to show cell membranes (blue) and mitochondria (red). Magnification: x365 when printed at 10 centimetres across.
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