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Nerlov

This microscopy image, taken ten days after injury, shows that the muscle fibres of normal mice (left) had re-grown, while in mice which couldn’t boost C/EBPβ production (right) there were still many fibres that had not regenerated (arrowheads), and the tissue had a number of scars (arrows).

To regenerate muscle, cellular garbage men must become builders

For scientists at the European Molecular Biology Laboratory (EMBL) in Monterotondo, Italy, what seemed like a disappointing result turned out to be…

By Guest author(s)

Science

In normal skin (left), the stem cells at the base, shown in green, differentiate into skin cells, shown in red. In mice whose skin has neither C/EBPα nor C/EBPβ (middle), this differentiation is blocked: green-labeled stem cells appear in upper layers of skin, and there are no differentiated skin cells (no red staining). This also happens at the initial stages of basal cell carcinomas. In skin where C/EBPα is present but has lost its capacity to interact with E2F, a molecule that regulates the cell cycle (right), skin cells start differentiating abnormally, before they have properly exited the stem cell ‘program’ (yellow/orange). This is similar to what is observed in the initial stages of squamous cell carcinomas, a more aggressive and invasive skin tumour.

How stem cells make skin

Stem cells have a unique ability: when they divide, they can either give rise to more stem cells, or to a variety of specialised cell types. In both…

By Guest author(s)

Science

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