+Proteins are the molecular machines of life, executing nearly every cellular process. Their unique three-dimensional [Structure](/wiki/structure) precisely defines their role, whether in [Catalysis](/wiki/catalysis), transport, or defense. This intricate relationship between form and action is fundamental to all biological activity.
+## See also
+- [Protein](/wiki/protein)
+- [Enzyme](/wiki/enzyme)
+- [Cell](/wiki/cell)
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