Heart muscle cells (shown in green), regress to a more youthful  state after injury, start dividing again (indicated by a red marker) to replenish lost cells and then mature a second time into cardiomyocytes.

Heart muscle cells (shown in green), regress to a more youthful state after injury, start dividing again (indicated by a red marker) to replenish lost cells and then mature a second time into cardiomyocytes.

Cool Science Images

A healthy glow: Human melanocyte skin cells fluoresce as their calcium signaling spikes after exposure to ultraviolet light and retinal, a key step in producing melanin. This led researchers to discover rhodopsin receptors in skin, which detect UVA light.

Stem cells turning into neurons. From UW Madison cool science image contest http://www.news.wisc.edu/slideshows/coolscience2012/10

In Directing Stem Cells, Study Shows Context Matters - Figuring out how blank slate stem cells decide which kind of cell they want to be when they grow up — a muscle cell, a bone cell, a neuron — has been no small task for science.

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