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<p>Importing a new version from external source</p> <p><b>New page</b></p><div>=== Abundance in cells ===<br /> It has been estimated that average-sized [[bacteria]] contain about 2 million proteins per cell (e.g. &#039;&#039;[[Escherichia coli|E. coli]]&#039;&#039; and &#039;&#039;[[Staphylococcus aureus]]&#039;&#039;). Smaller bacteria, such as &#039;&#039;[[Mycoplasma]]&#039;&#039; or &#039;&#039;[[Spirochaete|spirochetes]]&#039;&#039; contain fewer molecules, on the order of 50,000 to 1 million. By contrast, [[Eukaryote|eukaryotic]] cells are larger and thus contain much more protein. For instance, [[Saccharomyces cerevisiae|yeast]] cells have been estimated to contain about 50 million proteins and [[human]] cells on the order of 1 to 3 billion. The concentration of individual protein copies ranges from a few molecules per cell up to 20 million. Not all genes coding proteins are expressed in most cells and their number depends on, for example, cell type and external stimuli. For instance, of the 20,000 or so proteins encoded by the human genome, only 6,000 are detected in [[lymphoblastoid]] cells.</div>

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