One of the nucleotides within the unnatural base pairs can be modified with a fluorescent tag. When this modified nucleotide is incorporated into the RNA during transcription, it allows for site-specific fluorescent labeling of the RNA molecule.
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3-(5-O-(4,4'-dimethoxytrityl)-β-D-ribofuranosyl)-5-iodo-2-oxo(1H)pyridine
C18H22N4O2S2
Benzoic acid, 4-(1,3-dihydro-1-oxo-2H-isoindol-2-yl)-, ethyl ester
4-N-benzoyl-2'-O-(9-phenylxanthen-9-yl)cytidine
21-[4-((1E,3E,5E)-6-Phenyl-hexa-1,3,5-trienyl)-phenyl]-henicosanoic acid
