Since the DNA of each organism is unique, the proteins that it makes are also unique to itself. The proteome is the entire complement of proteins, including the modifications made to some of them, produced by an organism at any particular time.
A cellular proteome is all the proteins found in a specific cell type under a particular set of environmental conditions.
Since the proteome is unique, it constitutes a "fingerprint" of the organism that produced it.
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| Yeast proteome |
Source: http://www.moleculardetective.org/TutorialProteomics/TutorialProteomicsPage4.html
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