A cell nucleus with the Barr body marked in green. (IMAGE)

Technical University of Munich (TUM)

A cell nucleus with the Barr body marked in green.

Caption

In female mammals, one of the two X chromosomes is usually inactive and forms the so-called Barr body. The image shows a cell nucleus with the Barr body marked in green.

Credit

Daniel Andergassen / TUM

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Free for use in reporting on https://doi.org/10.1038/s43587-025-00856-8 with the copyright noted

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