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What is it??
Compare cells before and after perturbation:
Techniques include microarray, functional annotation techniques.
Group together genes with similar patterns of expression:
Clustering can be thoughtof as forming a phylogenetic tree of genes or tissues. Genes arenear each other on the "gene tree" if they show a strong correlationacross experiments, and tissues are near each other on the "tissuetree" if they have similar gene expression patterns.