| http://www.w3.org/ns/prov#value | - Approaches and tools such as labels that attach to specific peptide or nucleotide moieties, Fluorescent Resonance Energy Transfer, Green Fluorescent Protein (and mutant color variants), and genetically-engineered voltage or ion-sensitive fluorophores are making it possible to begin to visualize not only the distribution of molecular species in cells, but the manner in which they interact.
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