Act globally, think locally: systems biology addresses the PDZ domain.
Interaction networks, cartography and mapping, wiring and circuitry, whichever metaphor is invoked, the cardinal questions regarding cellular proteins are the same: What are they? How much is there? What do they do, and to whom do they do it? One of the more recent proteomics tools to pursue these lines of inquiry is the protein microarray, and a current report has unleashed this formidable technique upon a target of considerable biological interest, the PDZ domain family of signaling molecules.
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