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Colorized scanning electron micrograph of surface of human skin. The outermost layer of skin is called the stratum corneum and is composed primarily of keratinocytes, living and dead. Dead cells form horny scales, and release peptides called defensins, which are part of the first line of immune defense mechanisms. Eye of Science/SPL
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Science in Pictures

A weekly image series featuring selected pictures in science • Human skin

Mar 23, 2026
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