Cells can be thought of as cities, with factories, a transport system, and lots of building activity. An international team led by scientists at the University of Groningen studied cells growing under different conditions and measured the speed of molecule transport. They found that some conditions led to changes in the mobility inside the cells, caused by the clustering of proteins that produce the building materials for growth. It could be that clustering enables the proteins to produce those building blocks more efficiently. The research is published in the journal Molecular Cell.

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