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Gentle ions for cryo-FIB milling.

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Summary

Focused ion beam milling for cryo-electron microscopy (cryo-EM) creates thin samples but damages cells. This study quantifies that damage and offers methods to minimize it for better imaging.

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Area of Science:

  • Structural biology
  • Microscopy techniques
  • Cell biology

Background:

  • Cryo-electron microscopy (cryo-EM) requires thin samples, typically a few hundred nanometers thick.
  • Focused ion beam (FIB) milling is used to create thin lamellae from larger biological samples like cells and tissues for cryo-EM.
  • FIB milling can induce significant damage to biological specimens, potentially affecting structural integrity and imaging quality.

Purpose of the Study:

  • To quantitatively assess the extent of damage caused by FIB milling in biological samples intended for cryo-EM.
  • To identify the types of damage induced by FIB milling.
  • To propose strategies for minimizing FIB-induced damage to improve sample quality for cryo-EM.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) was used to image samples before and after FIB milling.
  • Quantitative analysis was performed to measure structural changes and damage.
  • Comparison of different FIB milling parameters and potential mitigation techniques.

Main Results:

  • FIB milling introduces specific types of damage, including amorphization and structural alterations.
  • The extent of damage is dependent on milling parameters such as ion current and milling time.
  • Identified parameters that minimize damage while achieving sufficient sample thickness.

Conclusions:

  • FIB milling is a valuable technique for preparing samples for cryo-EM but requires careful optimization.
  • Understanding and quantifying FIB-induced damage is crucial for accurate structural determination.
  • Implementing suggested mitigation strategies can improve the quality of cryo-EM data obtained from FIB-milled samples.