# 5.4 Specialised applications: Studying molecular dynamics

Fluorescence microscopy can also be used to investigate real-time molecular interactions and dynamics within live cells. Two commonly used techniques are:

- Fluorescence Resonance Energy Transfer (FRET): Measures the energy transfer between two fluorescent molecules in close proximity, allowing researchers to study protein–protein interactions, conformational changes, and signal transduction pathways at the nanoscale.
- Fluorescence Recovery After Photobleaching (FRAP): Involves irreversibly bleaching a region of fluorescence and monitoring the movement and replacement of fluorescent molecules into that region over time. This helps in understanding protein mobility, membrane fluidity, and molecular binding dynamics.

OpenLearn - Exploring cells with digital fluorescence microscopy
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