X-ray laser reveals how bacterial protein morphs in response to light

Human biology is a massive collection of chemical reactions, from the intricate signaling network that powers our brain activity to the body's immune response to viruses and the way our eyes adjust to sunlight. All involve proteins, known as the molecules of life; and scientists have been steadily moving toward their ultimate goal of following these life-essential reactions step by step in real time, at the scale of atoms and electrons.

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