A simulation shows twisting actin filaments found in neurons that form bundles with the help of a large protein, CaMKII. The twists arrange binding pockets to make the three domains of CaMKII a perfect fit. Researchers at Rice University, the University of Houston and the University of Texas Health Science Center at Houston believe the complex is key in the formation of long-term memory. (Credit: Wolynes Research Lab/Rice University)

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