Key activities in genomics and proteomics are related to the use of classifications (ontologies). The three main activities are: 1. Annotation of gene function after large-scale genome sequencing projects or in protein data-bases. 2. Annotation of the possible function common to sets of genes with similar expression profiles (determined after DNA array experiments). 3. Annotation of the characteristic functions of groups of proteins, protein complexes and biological pathways (determined by proteomics approaches).
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