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<p>to determine their <a href="page.php?w=Protein_tertiary_structure">three-dimensional structure</a>. This is the topic of the scientific field of <a href="page.php?w=structural_biology">structural biology</a>, which employs techniques such as <a href="page.php?w=X-ray_crystallography">X-ray crystallography</a>, <a href="page.php?w=protein_NMR">NMR spectroscopy</a>, <a href="page.php?w=Cryogenic_electron_microscopy">cryo-electron microscopy (cryo-EM)</a> and <a href="page.php?w=dual_polarisation_interferometry">dual polarisation interferometry</a>,</p><p>
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