KSENIYA SHUTURMINSKA / SCIENCE PHOTO LIBRARY KSENIYA SHUTURMINSKA / SCIENCE PHOTO LIBRARY
Coloured scanning electron micrograph (SEM) of apatite (red) growing out of a polydimethylsiloxane (PDMS) substrate, forming cracks (green) as it erupts on the surface. Apatite is the main mineral content of human bones and teeth. There's a lot of interest in understanding how apatite formation occurs so that it can be replicated to treat decayed tooth enamel.
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