Researchers have developed a method to turn protein function on and off using magnetic fields from handheld magnets. This technique, published in Nature, represents a significant advance in biological control tools, allowing for precise manipulation of cellular processes without direct physical contact.

The approach leverages magnetic nanoparticles that bind to specific proteins, enabling external magnetic fields to trigger conformational changes. This provides a non-invasive alternative to traditional genetic or chemical switches, with potential applications in synthetic biology, targeted drug delivery, and studying disease mechanisms in living systems.

Future work will focus on improving specificity and efficiency for complex organisms. The ability to remotely control proteins could accelerate research in cell engineering and therapeutic development, though challenges remain in scaling the technology for clinical use.