They play a leading role not only in muscle cells: Actin filaments are one of the most abundant proteins in all mammalian cells. The filigree structures form an important part of the cytoskeleton and locomotor system. Cell biologists at the University of Freiburg are now using cell cultures to show how receptor proteins in the plasma membrane of these cells transmit signals from the outside to actin molecules inside the nucleus, which then form threads.
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Source: Phys.org