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Colorized scanning electron micrograph depicts normal red blood cells (red, concave) with elongated blood cells indicative of sickle-cell disease (pink). Image courtesy of Eye of Science/SPL.
Institute News

Science in Pictures

A weekly image series featuring selected pictures in science • Blood cells

Mar 16, 2026
Colorized scanning electron micrograph of human lung tissue, depicting alveoli and bronchus. Lung alveoli are tiny, grape-like sacs, numbering in the millions, where essential gas exchange (oxygen/carbon dioxide) occurs. Image courtesy of Dennis Kunkel/SPL.
Institute News

Science in Pictures

A weekly image series featuring selected pictures in science • Human lung tissue

Mar 9, 2026