Proteins or proteins (rare: proteins) are constructed from amino acids macromolecules. Proteins are the building blocks of all cells. They give not only the cell structure, but transport is the molecular "machines" that the substances to pump ions that catalyze chemical reactions and signaling molecules identified. The totality of all proteins in an animal, a tissue, a cell or a cell compartment, under precisely defined conditions and at a certain time, known as proteomics.
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