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Structures discussed in this review: amino acids for stable isotopic labeling (top row), methionine and analogs that are substrates for wild-type methionyl-tRNA synthetases (second row), methionine analogs that require the expression of mutant methionyl-tRNA synthetases for proteomic incorporation (third row), and uridine and uracil as well as their thio-substituted analogs 4-thiouridine and 4-thiouracil (last row).
