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False color scanning electron micrograph of a single human ovum or egg cell. Human ova are among the largest cells in the human body and are visible to the naked eye, roughly the size of a single, small grain of sand. Image courtesy of SPG.
Institute News

Science in Pictures

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

Mar 30, 2026
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
Institute News

Science in Pictures

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

Mar 23, 2026