Lung tissue. Fluorescence deconvolution micrograph of a section through lung tissue. This tissue sample shows a cross-section through an arteriole (small artery, black, lower right) in the lung at the point where it transitions to a thinner vessel (such as a capillary, black, upper left). The lungs are where blood is oxygenated, with the oxygen replacing the waste product carbon dioxide that is produced during respiration in body cells. Cellular proteins are highlighted with fluorescent markers: g-actin (red), f-actin (green) and smooth muscle actin (blue).
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