The process by which molecules arrange themselves into a highly ordered, repeating three-dimensional structure called a crystal. In protein science, this is essential for determining atomic-level structure through X-ray crystallography.
From Greek 'krystallos' meaning ice or crystal, originally referring to clear quartz that ancients thought was permanently frozen water. The scientific understanding evolved from mineralogy to encompass any ordered molecular arrangement.
Protein crystallization is like convincing millions of molecular prima donnas to sit still in perfect formation! The conditions have to be just right - too much salt and they clump, too little and they stay dissolved, but hit the sweet spot and they form beautiful crystals that reveal their atomic secrets.
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