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Abstract
The combination of stimulated Raman scattering (SRS) microscopy with an alkyne group as a Raman-active tag allows high-contrast, live-cell dynamic imaging of a variety of biomolecules including DNA, RNA, protein, lipids and small-molecule drugs. Sensitive and specific visualization of small biomolecules in living systems is highly challenging. We report stimulated Raman-scattering imaging of alkyne tags as a general strategy for studying a broad spectrum of small biomolecules in live cells and animals. We demonstrate this technique by tracking alkyne-bearing drugs in mouse tissues and visualizing de novo synthesis of DNA, RNA, proteins, phospholipids and triglycerides through metabolic incorporation of alkyne-tagged small precursors.

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