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Methods for the detection of signalling nucleotides in bacterial extracts or within living cells. (a) Detection of nucleotides in cell extracts using an ELISA-based method. (b) Schematic of a riboswitch-based sensor for the detection of a specific signalling nucleotide in living cells. (c) Schematic of a FRET-based sensor for the detection of a signalling nucleotide in living cells.
